[{"dinoName":"Abydosaurus<\/em><\/strong>","dinoImages":"
Abydosaurus mcintoshi<\/em>.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/abydosaurus1.jpg\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Abydosaurus<\/em> site (DNM 106) with updated stratigraphic nomenclature.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/abydosaurus2.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Abydosaurus<\/em><\/h4>
Abydosaurus mcintoshi<\/em> was described in 2010 from near the middle of the Cedar Mountain Formation in a sandstone layer dated at 103 to 105 million years old at Dinosaur National Monument in a site only a few hundred meters west of the famed Carnegie Quarry visitors center. The bonebed was mistakenly attributed to the younger Mussentuchit Member, but ... Read More<\/a>

Abydosaurus<\/em><\/h4>
Abydosaurus mcintoshi<\/em> was described in 2010 from near the middle of the Cedar Mountain Formation in a sandstone layer dated at 103 to 105 million years old at Dinosaur National Monument in a site only a few hundred meters west of the famed Carnegie Quarry visitors center. The bonebed was mistakenly attributed to the younger Mussentuchit Member, but in this region the Mussentuchit Member is not present. This titanosauriform is the only North American Cretaceous sauropod known from complete skulls, although only one skull has been described. Additionally, the site preserves postcranial skeletal elements and a move is on at Dinosaur National Monument to reopen this important site.<\/div>","keywords":"saurischia, sauropodomorphs, sauropodomorpha, titanosauriform, titanosauria, middle Cretaceous, Cedar Mountain Formation, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•First complete sauropod dinosaur skull from the Cretaceous of the Americas and the evolution of sauropod dentition, by D. Chure, B. Britt, J.A. Whitlock, and J.A. Wilson, 2010<\/a>

•Cedar Mountain and Dakota Formations around Dinosaur National Monument-evidence of the first incursion of the Cretaceous Western Interior Seaway into Utah, by D.A. Sprinkel, S.K. Madsen, J.I. Kirkland, G.L. Waanders, and G.J. Hunt, 201<\/a>

•The Lower Cretaceous in east-central Utah-The Cedar Mountain Formation and its bounding strata, by J. Kirkland, M. Suarez, C. Suarez, and R. Hunt-Foster, 2016<\/a>



<\/div>","classification":"Saurischia, Sauropodomorpha, Titanosauria","age":"
1<\/div>\"Middle\" Cretaceous","formation":"Cedar Mountain Formation"},{"dinoName":"Acristavus<\/em><\/strong>","dinoImages":"
Acristavus<\/em> skull on exhibit in Japan.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/acristavus1.jpg\">\r\n\t\t\t\"\"\t\r\n\t\t\t\r\n\t\t\t\t<\/span>\r\n\t\t\t<\/span>\r\n\t\t<\/a><\/div>","dinoDescription":"

Acristavus<\/em><\/h4>
Acristavus gagslarsoni<\/em> is an uncrested, brachylophosurine hadrosaurid relative of Brachylophosaurus<\/em> (short-crested lizard) and Maisaurus<\/em> (the good mother lizard) that was described in 2011 from the Two Medicine Formation of Montana and is estimated to be between 80 and 79 million years old. A less well-preserved specimen of the gen ... Read More<\/a>

Acristavus<\/em><\/h4>
Acristavus gagslarsoni<\/em> is an uncrested, brachylophosurine hadrosaurid relative of Brachylophosaurus<\/em> (short-crested lizard) and Maisaurus<\/em> (the good mother lizard) that was described in 2011 from the Two Medicine Formation of Montana and is estimated to be between 80 and 79 million years old. A less well-preserved specimen of the genus was also described from correlative strata in the upper part of the Reynolds Point Member of the Wahweap Formation in Utah.<\/div>","keywords":"ornithischia, ornithopoda, hadrosaurid, hadrosauridae, saurolophinae, late cretaceous, Wahweap Formation, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•New unadorned hadrosaurine hadrosaurid (Dinosauria, Ornithopoda) from the Campanian of North America, by T.A. Gates, J.R. Horner, R.R. Hanna, and C.R. Nelson, 2011<\/a>

•A new brachylophosaurin hadrosaur (Dinosauria: Ornithischia) with an intermediate nasal crest from the Campanian Judith River Formation of northcentral Montana, by E.A. Freedman-Fowler and J.R. Horner, 2015<\/a>



<\/div>","classification":"Ornithischia, Ornithopoda, Hadrosauridae","age":"
0<\/div>Late Cretaceous (100-66 Ma)","formation":"Wahweap Formation"},{"dinoName":"Acrocanthosaurus<\/em><\/strong>","dinoImages":"
Acrocanthosaurus<\/em> tooth (cast), note the extremely fine serrations on this huge tooth.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/acrocanthosaurus1.JPG\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Acrocanthosaurus<\/em> from the eastern Antlers Formation of eastern Oklahoma on exhibit at the North Carolina Museum of Natural History. Note the tall neural spines running down its neck and back. Photos courtesy of Jim Kirkland.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/ acrocanthosaurus2.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Acrocanthosaurus<\/em><\/h4>
Acrocanthosaurus<\/em> was a giant carnivore that lived during the later part of the Early Cretaceous. It was nearly as large as Tyrannosaurus<\/em>, which lived at the end of the Cretaceous Period. With enormous teeth adapted for cutting flesh, this predator ruled the world in which it lived. It is a distinctive relative to all other North American ca ... Read More<\/a>

Acrocanthosaurus<\/em><\/h4>
Acrocanthosaurus<\/em> was a giant carnivore that lived during the later part of the Early Cretaceous. It was nearly as large as Tyrannosaurus<\/em>, which lived at the end of the Cretaceous Period. With enormous teeth adapted for cutting flesh, this predator ruled the world in which it lived. It is a distinctive relative to all other North American carnosaurs due to the tall neural spines on its vertebra that would not have formed a sail, but served as anchors for strong back muscles. It is known only by its distinctive, finely serrated teeth found in the middle part of the Cedar Mountain Formation in the area around the San Rafael Swell.<\/div>","keywords":"saurischia, theropods, theropoda, carnosaurs, carnosauria, middle Cretaceous, Ruby Ranch Member, Cedar Mountain Formation, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•Large, Early Cretaceous Theropods in North America by S.G. Lucas, J.I. Kirkland, J.W. Estep, 1998<\/a>

<\/div>","classification":"Saurischia, Theropoda, Carnosauria","age":"
1<\/div>\"Middle\" Cretaceous","formation":"Cedar Mountain Formation (Ruby Ranch Member)"},{"dinoName":"Adelolophus<\/em><\/strong>","dinoImages":"
Adelolophus<\/em> in the collections of the University of California Museum of Paleontology, Berkeley.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/adelolophus1.jpg\">\r\n\t\t\t\"\"\t\r\n\t\t\t\r\n\t\t\t\t<\/span>\r\n\t\t\t<\/span>\r\n\t\t<\/a><\/div>","dinoDescription":"

Adelolophus<\/em><\/h4>
Adelolophus hutchinsoni<\/em> consists solely of an incomplete right maxilla (upper jaw) with both ends broken off (UCMP 152028). It was collected from the Wahweap Formation near Death Ridge in Kane County, Utah, by retired Berkeley paleontologist Howard Hutchinson in 1999 and formally described as a distinct species related to Parasaurolophus<\/em> in ... Read More<\/a>

Adelolophus<\/em><\/h4>
Adelolophus hutchinsoni<\/em> consists solely of an incomplete right maxilla (upper jaw) with both ends broken off (UCMP 152028). It was collected from the Wahweap Formation near Death Ridge in Kane County, Utah, by retired Berkeley paleontologist Howard Hutchinson in 1999 and formally described as a distinct species related to Parasaurolophus<\/em> in 2014. It is considered the oldest lambeosaurine in North America. Adelolophus<\/em> means unknown crest, referring to how little is known of the skull. A different undescribed lambeosaurine maxilla UMNH VP 16666 was collected in the Reynolds Point Member of the Wahweap Formation at Death Ridge in Grand Staircase-Escalante National Monument.<\/div>","keywords":"ornithischia, ornithopoda, hadrosaurid, hadrosauridae, lambeosaurine, lambeosaurinae, late cretaceous, Wahweap Formation, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•New hadrosaurid (Dinosauria, Ornithopoda) specimens from the lower-middle Campanian Wahweap Formation of southern Utah, by T.A. Gates, Z. Jinnah, C. Levitt, and M.A. Getty, 2014<\/a>

•Fauna and setting of the Adelolophus hutchisoni<\/em> type locality in the Upper Cretaceous (Campanian) Wahweap Formation of Utah, by P.A. Holroyd, and H.J. Hutchison, 2016<\/a>

•Refined geochronology and revised stratigraphic nomenclature of the Upper Cretaceous Wahweap Formation, Utah, U.S.A. and the age of early Campanian vertebrates from southern Laramidia, by T.L. Beveridge, E.M. Roberts, J. Ramezani, A.L. Titus, J.G. Eaton, R.B. Irmis, and J.J.W. Sertich, 2022<\/a>



<\/div>","classification":"Ornithischia, Ornithopoda, Hadrosauridae, Lambeosaurinae","age":"
0<\/div>Late Cretaceous (100-66 Ma)","formation":"Wahweap Formation"},{"dinoName":"Akainocephalus<\/em><\/strong>","dinoImages":"
Akainocephalus<\/em> as mounted by Robert Gaston, Gaston Design Inc. Photo courtesy of Jim Kirkland.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/akainocephalus1.jpg\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Akainocephalus<\/em> as exhibited at the Natural History Museum of Utah, Salt Lake City, with view of skull emphasizing flange behind the beak separating nasal opening from the front of the skull.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/akainocephalus2.JPG\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Akainocephalus<\/em><\/h4>
Described in 2018, Akainacephalus johnsoni<\/em> is the first Ankylosaurid with a tail club described from Utah. Much of the skeleton (UMNH VP 20202) was collected by the Natural History Museum of Utah from the Kaiparowits Formation in Grand Staircase-Escalate National Monument. The skull roof has a tall peaked ornament unlike the much flatter ornament on ... Read More<\/a>

Akainocephalus<\/em><\/h4>
Described in 2018, Akainacephalus johnsoni<\/em> is the first Ankylosaurid with a tail club described from Utah. Much of the skeleton (UMNH VP 20202) was collected by the Natural History Museum of Utah from the Kaiparowits Formation in Grand Staircase-Escalate National Monument. The skull roof has a tall peaked ornament unlike the much flatter ornament on the skulls of Late Cretaceous ankylosaurs from Montana and southern Alberta. In this character they are more like the ancestral populations of ankylosaurids from Asia, suggesting that ankylosaurids first entered North America by migrating south along the Pacific Coast before entering Utah from the south. Another notable feature of Akainocephalus<\/em> is that its nasal opening is separated from the front surface of the skull by a large flange of bone. What purpose this bone would have served is not known.<\/div>","keywords":"ornithischia, Armored Dinosaurs, Thyreophorans, thyreophora, Ankylosaurid, ankylosauria, late cretaceous, Kaiparowits Formation, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•Utah's prehistoric tanks-the ankylosaurs, by J.I. Kirkland, 2011<\/a>

•A new southern Laramidian ankylosaurid, Akainacephalus johnsoni<\/em> gen. et sp. nov., from the upper Campanian Kaiparowits Formation of southern Utah, USA, by J.P. Wiersma R.B. Irmis, 2018<\/a>



<\/div>","classification":"Ornithischia, Thyreophora, Ankylosauria","age":"
0<\/div>Late Cretaceous (100-66 Ma)","formation":"Kaiparowits Formation"},{"dinoName":"Alamosaurus<\/em><\/strong>","dinoImages":"
Alamosaurus<\/em> as exposed by the Smithsonian North Horn expedition from Gilmore (1946).\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/alamosaurus1.jpg\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Tyrannosaurus rex<\/em> and Alamosaurus<\/em> as exhibited at the Perot Museum, Dallas, Texas. They have only been found together in the North Horn Formation of central Utah. Photo courtesy of Matt Wedel.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/alamosaurus2.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Alamosaurus<\/em><\/h4>
Alamosaurus<\/em>, a large quadrupedal herbivore, was the only sauropod dinosaur in North America at the time of the great dinosaur extinction 65 million years ago. It was named in 1922 for Ojo Alamo Wash in New Mexico (not the Alamo in San Antonio, Texas). A more complete specimen of Alamosaurus was found on the Wasatch Plateau of central Utah, where its ... Read More<\/a>

Alamosaurus<\/em><\/h4>
Alamosaurus<\/em>, a large quadrupedal herbivore, was the only sauropod dinosaur in North America at the time of the great dinosaur extinction 65 million years ago. It was named in 1922 for Ojo Alamo Wash in New Mexico (not the Alamo in San Antonio, Texas). A more complete specimen of Alamosaurus was found on the Wasatch Plateau of central Utah, where its bones are associated with Tyrannosaurus<\/em> and Torosaurus<\/em>. Alamosaurus<\/em> may be the largest dinosaur known in North America.<\/div>","keywords":"saurischia, sauropodomorphs, sauropodomorpha, titanosauriform, titanisauria, North Horn Formation, late cretaceous, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•A new sauropod dinosaur from the Ojo Alamo Formation of New Mexico (with two plates), by C.W. Gilmore, 1922<\/a>

•Reptilian fauna of the North Horn Formation of central Utah, by C.W. Gilmore, 1946<\/a>

•The first giant titanosaurian sauropod from the Upper Cretaceous of North America, by D.W. Fowler and R.M. Sullivan, 2011<\/a>

•Equatorial Minnesota on Alamosaurus<\/em>, by Matt Wedel, 2021<\/a>



<\/div>","classification":"Saurischia, Sauropodomorpha, Titanosauria","age":"
0<\/div>Late Cretaceous (100-66 Ma)","formation":"North Horn Formation"},{"dinoName":"Allosaurus<\/em><\/strong>","dinoImages":"
Allosaurus<\/em> mounts based on material from the Cleveland-Lloyd Dinosaur Quarry at the Museum of the San Rafael in Castle Dale, Utah.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/allosaurus1.jpg\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Allosaurus fragilis<\/em> cast on exhibit at Jurassic National Monument.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/allosaurus2.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Allosaurus jimmadseni<\/em> post crania being prepared by Ann Elder at Dinosaur National Monument.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/allosaurus4.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Allosaurus<\/em><\/h4>
Allosaurus<\/em>, Utah's State Fossil, was the dominant predator of western North America during the Late Jurassic. It is best known from numerous skeletons of Allosaurus fragilis<\/em>, ranging from 10 to 40 feet in length, from the Cleveland-Lloyd Dinosaur Quarry in Jurassic National Monument in east-central Utah. Mounted skeletons, cast from Clevela ... Read More<\/a>

Allosaurus<\/em><\/h4>
Allosaurus<\/em>, Utah's State Fossil, was the dominant predator of western North America during the Late Jurassic. It is best known from numerous skeletons of Allosaurus fragilis<\/em>, ranging from 10 to 40 feet in length, from the Cleveland-Lloyd Dinosaur Quarry in Jurassic National Monument in east-central Utah. Mounted skeletons, cast from Cleveland-Lloyd allosaurs, are displayed in over three dozen museums around the world, making it one of the best known dinosaurs. Whereas Allosaurus fragils<\/em> is from the upper Morrison Formation, a second species was recently described from the lower Morrison, Allosaurus jimmadseni<\/em>, named for Utah's first State Paleontologist Jim Madsen. A third species, Allosaurus europeaus<\/em>, has been identified in the Upper Jurassic Lourinha Formation on the coast of Portugal, providing evidence that it was still possible for animals to cross back and forth from North America to Europe during the Late Jurassic.<\/div>","keywords":"saurischia, theropods, theropoda, carnosaurs, carnosauria, Morrison Formation, late jurassic, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•Allosaurus fragilis<\/em>-A revised osteology, by J.H. Madsen Jr., 1993<\/a>

•Dinosaurs: The Encyclopedia-\"Allosaurus<\/em>,\" by D.F. Glut, 1997<\/a>

•The large theropod fauna of the Lourinha Formation (Portugal) and its similarity to that of the Morrison Formation, with a description of a new species of Allosaurus<\/em>, by O. Mateus, A. Walen, and M.T. Antunes, 2006<\/a>

•Cranial anatomy of Allosaurus jimmadseni<\/em>, a new species from the lower part of the Morrison Formation (Upper Jurassic) of Western North America, by D.J. Chure and M.A. Loewen, 2020<\/a>



<\/div>","classification":"Saurischia, Theropoda, Carnosauria","age":"
3<\/div>Late Jurassic (163-145 Ma)","formation":"Morrison Formation"},{"dinoName":"Animantarx<\/em><\/strong>","dinoImages":"
Animantarx<\/em>, Photo courtesy of Robert Gaston, Gaston Design Inc.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/animantarx1.jpg\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Animantarx ramaljonesi<\/em> bones at the Utah State University Eastern Prehistoric Museum, Price, Utah.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/animantarx2.JPG\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Animantarx<\/em><\/h4>
Animantarx<\/em> is a small armored nodosaurid ankylosaur only about 10 feet long. It was first discovered by University of Utah radiological technician Ramal Jones near where his wife Carol discovered the first specimen of Eolambia<\/em>. He performed a detailed survey of the low radiation levels across the area as he knew the bones there were slightl ... Read More<\/a>

Animantarx<\/em><\/h4>
Animantarx<\/em> is a small armored nodosaurid ankylosaur only about 10 feet long. It was first discovered by University of Utah radiological technician Ramal Jones near where his wife Carol discovered the first specimen of Eolambia<\/em>. He performed a detailed survey of the low radiation levels across the area as he knew the bones there were slightly radioactive. Finding a spot that was slightly radioactive, he said, \"Dig here,\" and, lo and behold, the first dinosaur ever discovered solely by technology was found. The dinosaur was named Animantarx ramaljonesi<\/em> in his honor and joined Eolambia caroljonesa<\/em> among Utah's newest dinosaurs in 1999.<\/div>","keywords":"ornithischia, Armored Dinosaurs, Thyreophorans, thyreophora, Ankylosauria, nodosaurids, nodosauridae, middle Cretaceous, Mussentuchit Member, Cedar Mountain Formation, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•Ankylosaurs (Ankylosauria: Ornithischia) of the Cedar Mountain Formation, Utah, and their stratigraphic distribution, by K. Carpenter, J.I. Kirkland, D. Burge, and J. Bird, 1999<\/a>

•Radiological surveying as a method for mapping dinosaur bone sites, by R.D. Jones and D.L. Burge, 1995

•Utah's prehistoric tanks-the ankylosaurs, by J.I. Kirkland, 2011<\/a>



<\/div>","classification":"Ornithischia, Thyreophora, Ankylosauria, Nodosauridae","age":"
1<\/div>\"Middle\" Cretaceous","formation":"Cedar Mountain Formation (Mussentuchit Member)"},{"dinoName":"Apatosaurus<\/em><\/strong>","dinoImages":"
Brontosaurus<\/em> mount with wrong skull in old exhibit at the American Museum of Natural History, New York City, New York.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/apatosaurus1.jpg\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Apatosaurus<\/em> mount at the University of Wyoming Geology Museum's mounted skeleton. Note the squared-off muzzle for cropping ferns close to the ground.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/apatosaurus2.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Apatosaurus<\/em><\/h4>
Apatosaurus<\/em> was for many years known as Brontosaurus<\/em>, but because Apatosaurus ajax<\/em> from Colorado was named before the closely related Brontosaurus excelsus<\/em> was named in Wyoming, it had to be renamed Apatosaurus<\/em>. However, these animals have been separated again, and there are several species identified under each g ... Read More<\/a>

Apatosaurus<\/em><\/h4>
Apatosaurus<\/em> was for many years known as Brontosaurus<\/em>, but because Apatosaurus ajax<\/em> from Colorado was named before the closely related Brontosaurus excelsus<\/em> was named in Wyoming, it had to be renamed Apatosaurus<\/em>. However, these animals have been separated again, and there are several species identified under each genus. At present, only Apatosaurus<\/em> has been recognized in the Upper Jurassic Morrison Formation in Utah. Apatosaurus louisae<\/em> was named for the wife of steel tycoon and philanthropist Andrew Carnegie who funded much of the early excavations at Dinosaur National Monument. A partial skeleton collected from the topmost surface of the Morrison Formation at Arches National Park may belong to Apatosaurus ajax<\/em>. This heavily built quadrupedal giant of the Jurassic Period weighed more than 30 tons, or as much as six average elephants. With lengths approaching 80 feet, Apatosaurus<\/em> was a giant in the Age of Dinosaurs. Another interesting story of the Apatosaurus-Brontosaurus<\/em> tale is that, since the nearly complete skeleton of the first Brontosaurus excelsus<\/em> lacked a skull, paleontologist O.C. Marsh put the head of a Camarasaurus<\/em> on it in his reconstruction and the mounted skeleton at Yale. Thus, the wrong-headed sauropod became the symbol of giant sauropod dinosaurs for 100 years until the proper head for Apatosaurus<\/em> was identified at Dinosaur National Monument and it was realized the head was like that of other diplodocids.<\/div>","keywords":"saurischia, Sauropodomorphs, sauropodomorpha, diplodocids, diplodocidae, late jurassic, Morrison Formation, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•Notice of new Jurassic reptiles, by O.C. Marsh, 1879<\/a>

•Restoration of Triceratops (and Brontosaurus), by O.C. Marsh, 1891<\/a>

•Osteology of Apatosaurus<\/em>, with special references to specimens in the Carnegie Museum, by C.W. Gilmore, 1936<\/a>

•Description of the palate and lower jaw of the sauropod dinosaur Diplodocus<\/em> (Reptilia: Saurischia) with remarks on the nature of the skull of Apatosaurus<\/em>, by J.S. McIntosh and D.S. Berman, 1975<\/a>

•A specimen-level phylogenetic analysis and taxonomic revision of Diplodocidae (Dinosauria, Sauropoda), by E. Tschopp, O. Mateus, and R.B.J. Benson, 2015<\/a>

•Brontosaurus is back! Brontosaurus is a unique genus after all!, by PeerJ, 2015<\/a>



<\/div>","classification":"Saurischia, Sauropodomorpha, Diplodocidae","age":"
3<\/div>Late Jurassic (163-145 Ma)","formation":"Morrison Formation"},{"dinoName":"Barosaurus<\/em><\/strong>","dinoImages":"
Barosaurus<\/em> illustration by Jun-Hyeok Jang.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/barosaurus1.jpeg\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Barosaurus<\/em> at the American Museum of Natural History, New York City, New York.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/barosaurus2.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Barosaurus<\/em> in the Cleveland-Lloyd Quarry exhibit at the Natural History Museum of Utah, Salt Lake City.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/barosaurus3.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Barosaurus<\/em> neck vertebra prepared at the Museum of Ancient Life at Thanksgiving Point, Lehi, Utah.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/barosaurus4.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Barosaurus<\/em><\/h4>
Barosaurus lentus<\/em> was a slender, long-necked, long-tailed sauropod. Because of its graceful anatomy, some paleontologists have argued that this sauropod could stand on its hind legs and reach high into the trees for food, perhaps to heights of 50 to 60 feet. A skeleton from Dinosaur National Monument mounted in the standing position was recently unv ... Read More<\/a>

Barosaurus<\/em><\/h4>
Barosaurus lentus<\/em> was a slender, long-necked, long-tailed sauropod. Because of its graceful anatomy, some paleontologists have argued that this sauropod could stand on its hind legs and reach high into the trees for food, perhaps to heights of 50 to 60 feet. A skeleton from Dinosaur National Monument mounted in the standing position was recently unveiled at the American Museum of Natural History in New York City. However, recent studies of its skull and neck suggest that along with its close relatives Apatosaurus<\/em> and Diplodocus<\/em>, Barosaurus<\/em> spent most of its time grazing on low-growing plants. Barosaurus<\/em> may have had the longest and broadest neck of any North American diplodocid. Additionally, it appears to have been one of the most common sauropods in Utah after Camarasaurus<\/em>.<\/div>","keywords":"saurischia, Sauropodomorphs, sauropodomorpha, diplodocids, diplodocidae, late jurassic, Morrison Formation, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•Thunder lizards: The sauropodomorph dinosaurs-The genus Barosaurus<\/em> Marsh (Sauropoda, Diplodocidae), by J.S. McIntosh, 2005<\/a>

•A specimen-level phylogenetic analysis and taxonomic revision of Diplodocidae (Dinosauria, Sauropoda), by E. Tschopp, O. Mateus, and R.B.J. Benson, 2015<\/a>

•The neck of Barosaurus<\/em>: longer, wider and weirder than those of Diplodocus<\/em> and other diplodocines, by M.P. Taylor and M.J. Wedel, 2016<\/a>



<\/div>","classification":"Saurischia, Sauropodomorpha, Diplodocidae","age":"
3<\/div>Late Jurassic (163-145 Ma)","formation":"Morrison Formation"},{"dinoName":"Brachiosaurus<\/em><\/strong>","dinoImages":"
Brachiosaurus<\/em> skull from Felch Quarry in central Colorado on exhibit at the Denver Museum of Nature and Science.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/brachiosaurus1.jpg\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Brachiosaurus<\/em> neck vertebrae (BYU 12866) with fused-on base of cervical rib from the Dry Mesa Quarry in exhibit in the Museum of Ancient Life at Thanksgiving Point, Lehi, Utah.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/brachiosaurus2.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Brachiosaurus<\/em> from Taylor (2009). Scale bar = 2 meters.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/brachiosaurus3.png\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Brachiosaurus<\/em><\/h4>
Brachiosaurus altithorax<\/em> was the largest and heaviest dinosaur known from the Jurassic-age Morrison Formation of Utah. The initial discovery was made just over the border near Grand Junction, Colorado, and is the basis for the mounted cast skeleton at the Museum of Ancient Life at Thanksgiving Point, Lehi, Utah, although it lacked the neck and skull ... Read More<\/a>

Brachiosaurus<\/em><\/h4>
Brachiosaurus altithorax<\/em> was the largest and heaviest dinosaur known from the Jurassic-age Morrison Formation of Utah. The initial discovery was made just over the border near Grand Junction, Colorado, and is the basis for the mounted cast skeleton at the Museum of Ancient Life at Thanksgiving Point, Lehi, Utah, although it lacked the neck and skull. A closely related brachiosaurid (now known as Giraffititan<\/em>) that included the skull and neck is known from several specimens from east Africa and is beautifully exhibited in Berlin, Germany. Described as Ultrasauros<\/em> by Brigham Young University's \"Dinosaur\" Jim Jensen from the Dry Mesa Quarry in western Colorado, it was actually a supergiant specimen of Brachiosaurus<\/em>, and may have weighed as much as 100 tons. Brachiosaurus<\/em> is a giraffe-necked sauropod, with tall front legs and a long neck designed to reach far above the ground. Only parts of Brachiosaurus<\/em> have been found in Utah.<\/div>","keywords":"saurischia, Sauropodomorphs, sauropodomorpha, brachiosaurids, brachiosauridae, late jurassic, Morrison Formation, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•Brachiosaurus altithorax<\/em>, the largest known dinosaur, by E.S. Riggs, 1903<\/a>

•Structure and relationships of opisthocoelian dinosaurs. Part II. The Brachiosauridae, by E.S. Riggs, 1904<\/a>

•A re-assessment of Ultrasauros macintoshi<\/em> (Jensen, 1985), by B. Curtice, K. Stadtman, and L. Curtice, 1996<\/a>

•Preliminary description of a Brachiosaurus<\/em> skull from Felch Quarry 1, Garden Park, Colorado, by K. Carpenter and V. Tidwell, 1998<\/a>

•A re-evaluation of Brachiosaurus altithorax<\/em> Riggs 1903 (Dinosauria, Sauropoda) and its generic separation from Giraffatitan brancai<\/em> (Janensh 1914), by M.P. Taylor, 2009<\/a>



<\/div>","classification":"Saurischia, Sauropodomorpha, Brachiosauridae","age":"
3<\/div>Late Jurassic (163-145 Ma)","formation":"Morrison Formation"},{"dinoName":"Brontomerus<\/em><\/strong>","dinoImages":"
Brontomerus<\/em> type locality in medial Ruby Ranch Member of the Cedar Mountain Formation. Note the basal sandstones of Naturita Formation at the top of the ridge and the top of the underlying Poison Strip Member at bottom of slope.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/brontomerus1.jpg\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Brontomerus<\/em> as reconstructed from plaster jacket. Photo courtesy of Jim Kirkland.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/brontomerus2.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Brontomerus<\/em> earning its moniker \"thunder thighs,\" by Francisco Gasco.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/brontomerus4.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Brontomerus<\/em><\/h4>
Brontomerus mcintoshi<\/em> was found in the Ruby Ranch Member of the Cedar Mountain Formation east of the Colorado River. The site had been opened up illegally and to date only a salvage operation has been done to collect the exposed bones. The locality is approximately 120 million years old and is the most eastern Cedar Mountain Formation dinosaur local ... Read More<\/a>

Brontomerus<\/em><\/h4>
Brontomerus mcintoshi<\/em> was found in the Ruby Ranch Member of the Cedar Mountain Formation east of the Colorado River. The site had been opened up illegally and to date only a salvage operation has been done to collect the exposed bones. The locality is approximately 120 million years old and is the most eastern Cedar Mountain Formation dinosaur locality known. A scattering of large and small sauropod bones were collected from the locality with teeth and claws of other animals. A small hip bone was hidden underneath a large shoulder blade and unfortunately was damaged when flipping over the large shoulder blade block. The hip bone was described in 2011 as the holotype of Brontomerus<\/em> (\"thunder thighs\") based on it being incorrectly reconstructed at the Schuler Museum at the University of Oklahoma. Both the large and the small bones of the sauropods from the site were referred to as Brontomerus<\/em>, although more than one sauropod species at the site is possible. Future excavation of the site would resolve numerous scientific issues.<\/div>","keywords":"saurischia, Sauropodomorphs, sauropodomorpha, titanosauriforms, titanosauria, middle Cretaceous, Ruby Ranch Member, Cedar Mountain Formation, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•A new sauropod dinosaur from the Lower Cretaceous Cedar Mountain Formation, Utah, USA, by M.P. Taylor, M.J. Wedel, and R.L. Cifelli, 2011<\/a>

<\/div>","classification":"Saurischia, Sauropodomorpha, Titanosauria","age":"
1<\/div>\"Middle\" Cretaceous","formation":"Cedar Mountain Formation (Ruby Ranch Member)"},{"dinoName":"Camarasaurus<\/em><\/strong>","dinoImages":"
Camarasaurus<\/em> and Allosaurus<\/em> at the old Prehistoric Museum in Price, Utah.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/camarasaurus1.jpg\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Camarasaurus lentus<\/em> CM 11338 from Dinosaur National Monument, Utah, on display at the Carnegie Museum of Natural History, Pittsburgh, Pennsylvania. This is the most complete sauropod ever discovered.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/camarasaurus2.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Camarasaurus lentus<\/em> DINO 2580 in the quarry wall at Dinosaur National Monument, Utah.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/camarasaurus3.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Camarasaurus<\/em><\/h4>
Camarasaurus<\/em> is the most abundant dinosaur in the Jurassic-age Morrison Formation and is represented by at least four species: C. grandis, C. lentus, C. lewisi,<\/em> and C. supremus<\/em>. Even with their relatively short neck and tail, this sauropod reached lengths of 60 to 70 feet and weighed as much as 35 tons. The rather massive spoon-lik ... Read More<\/a>

Camarasaurus<\/em><\/h4>
Camarasaurus<\/em> is the most abundant dinosaur in the Jurassic-age Morrison Formation and is represented by at least four species: C. grandis, C. lentus, C. lewisi,<\/em> and C. supremus<\/em>. Even with their relatively short neck and tail, this sauropod reached lengths of 60 to 70 feet and weighed as much as 35 tons. The rather massive spoon-like teeth chopped coarse vegetation (primarily conifers, cycads, and ferns), their principal food. Camarasarus lentus<\/em> appears to be the predominant Camarasaurid in Utah.<\/div>","keywords":"saurischia, Sauropodomorphs, sauropodomorpha, camarasaurids, camarasauridae, late jurassic, Morrison Formation, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•On a gigantic Saurian from the Dakota Epoch of Colorado, by E.D. Cope, 1877<\/a>

•A nearly complete articulated skeleton of Camarasaurus<\/em>, a saurischian dinosaur from the Dinosaur National Monument, by C. Gilmore, 1925<\/a>

•A new nearly complete skeleton of Camarasaurus<\/em>, by J.S. McIntosh, C.A. Miles, K.C. Cloward, and J.R. Parker, 1996<\/a>

•Distribution and biochronology of Camarasaurus<\/em> (Dinosauria, Sauropoda) from the Jurassic Morrison Formation of the Rocky Mountain Region, by T. Ikejiri, 2005<\/a>

•The dentition of a well-preserved specimen of Camarasaurus<\/em> sp.: implications for function, tooth replacement, soft part reconstruction, and food intake, by K. Wiersma and P.M. Sanders, 2017<\/a>



<\/div>","classification":"Saurischia, Sauropodomorpha, Camarasauridae","age":"
3<\/div>Late Jurassic (163-145 Ma)","formation":"Morrison Formation"},{"dinoName":"Camptosaurus<\/em><\/strong>","dinoImages":"
Camptosaurus dispar<\/em> skeletal reconstruction by Greg Paul from Carpenter and Galton (2018).\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/camptosaurus1.jpg\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Uteodon<\/em> from Carnegie Quarry at Dinosaur National Monument on display in the Carnegie Museum of Natural History in Pittsburg, Pennsylvania.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/camptosaurus2.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Camptosaurus<\/em><\/h4>
Camptosaurus dispar<\/em> was a medium-size, bipedal herbivore of the Late Jurassic that weighed up to 1,000 pounds and reached lengths up to 25 feet. This ornithopod retained a five-finger hand and was close to the ancestry of many of the highly successful plant-eating dinosaurs of the Cretaceous, such as the Iguanodonts in the Early Cretaceous and the h ... Read More<\/a>

Camptosaurus<\/em><\/h4>
Camptosaurus dispar<\/em> was a medium-size, bipedal herbivore of the Late Jurassic that weighed up to 1,000 pounds and reached lengths up to 25 feet. This ornithopod retained a five-finger hand and was close to the ancestry of many of the highly successful plant-eating dinosaurs of the Cretaceous, such as the Iguanodonts in the Early Cretaceous and the hadrosaurs in the Late Cretaceous. Several other species have been reassigned to Camptosaurus<\/em> and close relatives that are known from the Upper Jurassic of Europe. The camptosaur from the Morrison Formation in Dinosaur National Monument has been assigned to a new species, Camptosaurus aphanoecetes<\/em>, which some paleontologists support assigning to the new genus, Uteodon aphanoecetes.<\/div>","keywords":"ornithischia, ornithopoda, iguanodontia, late jurassic, Morrison Formation, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•Osteology of the Jurassic reptile Camptosaurus<\/em>, with a revision of the species of the genus, and descriptions of two new species, by C.W. Gilmore, 1909<\/a>

•A new species of Camptosaurus<\/em> (Ornithopoda: Dinosauria) from the Morrison Formation (Upper Jurassic) of Dinosaur National Monument, Utah, and a biomechanical analysis of its forelimb, by K. Carpenter and Y. Wilson, 2008<\/a>

•The taxonomy of species assigned to Camptosaurus<\/em> (Dinosauria: Ornithopoda), by A.T. McDonald, 2011<\/a>

•A photo documentation of bipedal ornithischian dinosaurs from the Upper Jurassic Morrison Formation, USA, by K. Carpenter and P. Galton, 2018<\/a>



<\/div>","classification":"Ornithischia, Ornithopoda, Iguanodontia","age":"
3<\/div>Late Jurassic (163-145 Ma)","formation":"Morrison Formation"},{"dinoName":"Cedarosaurus<\/em><\/strong>","dinoImages":"
Cedarosaurus<\/em> (DMNS 39045) laid out at the Denver Museum of Nature and Science.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/cedarosaurus1.jpg\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Cedarosaurus<\/em> type locality near mid-slope in the upper Yellow Cat Member below a cliff formed by the basal Poison Strip Member of the Cedar Mountain Formation.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/cedarosaurus2.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Cedarosaurus<\/em><\/h4>
Cedarosaurus weiskopfae<\/em> was the first (1999) sauropod dinosaur described from the Lower Cretaceous of Utah. Found in the upper Yellow Cat Member of the Cedar Mountain Formation south of Cisco, Utah, most of the skeleton of this brachiosaur sauropod from the shoulders back through the tail was recovered, including stomach stones or gastroliths. The g ... Read More<\/a>

Cedarosaurus<\/em><\/h4>
Cedarosaurus weiskopfae<\/em> was the first (1999) sauropod dinosaur described from the Lower Cretaceous of Utah. Found in the upper Yellow Cat Member of the Cedar Mountain Formation south of Cisco, Utah, most of the skeleton of this brachiosaur sauropod from the shoulders back through the tail was recovered, including stomach stones or gastroliths. The gastroliths found in this skeleton are not enough to fill a muscular gizzard for an animal of this size, but probably were in the stomach to help stir the vegetation that the animal ate during digestion. Cedarosaurus<\/em> is probably the same brachiosaurid species as the one found at the Dalton Wells Quarry at Utahraptor State Park.<\/div>","keywords":"Saurischia, Sauropodomorphs, sauropodomorpha, brachiosaurids, brachiosauridae, late cretaceous, Yellow Cat Member, Cedar Mountain Formation, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•New sauropod from the Lower Cretaceous of Utah, USA, by V.C. Tidwell, K. Carpenter, and W. Brooks, 1999<\/a>

•Gastroliths from the Lower Cretaceous sauropod Cedarosaurus weiskopfae<\/em>, by F. Sanders, K. Manley, and K. Carpenter, 2001



<\/div>","classification":"Saurischia, Sauropodomorpha, Brachiosauridae","age":"
0<\/div>Late Cretaceous (100-66 Ma)","formation":"Cedar Mountain Formation (Yellow Cat Member)"},{"dinoName":"Cedarpelta<\/em><\/strong>","dinoImages":"
Peleroplites<\/em> dwarfs both the elongate juvenile Cedarpelta<\/em> skull reconstruction and the even smaller Gastonia<\/em> skull in an ankylosaur exhibit at the Utah State University Eastern Prehistoric Museum in Price, Utah. Photo courtesy of Jim Kirkland.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/cedarpelta1.jpg\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Cedarpelta<\/em> skull reconstruction showing expansion of skull behind the eye as seen in all ankylosaurids.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/cedarpelta2.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Cedaropelta<\/em> type material (right) as compared with the much larger adult (left). Although it had shorter legs than Peleroplites<\/em>, an adult Cedarpelta<\/em> was also a gigantic animal.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/cedarpelta3.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Cedarpelta<\/em><\/h4>
Cedarpelta bilbyhallorum<\/em> is a giant ankylosaurid found with Peleroplites<\/em> in the Price River quarries near the top of the Ruby Ranch Member of the Cedar Mountain Formation, south of Price, Utah. It may have been as large as Peleroplites<\/em>. It was first described from two juvenile specimens with partial skulls from a bonebed across the ... Read More<\/a>

Cedarpelta<\/em><\/h4>
Cedarpelta bilbyhallorum<\/em> is a giant ankylosaurid found with Peleroplites<\/em> in the Price River quarries near the top of the Ruby Ranch Member of the Cedar Mountain Formation, south of Price, Utah. It may have been as large as Peleroplites<\/em>. It was first described from two juvenile specimens with partial skulls from a bonebed across the valley before an adult skeleton was found lacking a skull. Initially, it was thought to be a primitive ankylosaurid because of a number of distinctive features in the skull and skeleton. However, recent analyses suggest it may be tied to the origin of European struthiosaurine nodosaurids. Clearly, more research on this beast would be welcome.<\/div>","keywords":"ornithischia, Armored Dinosaurs, Thyreophorans, thyreophora, Ankylosaurid, ankylosauria, nodosaurids, nodosauridae, middle Cretaceous, Ruby Ranch Member, Cedar Mountain Formation, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•Disarticulated skull of a new primitive ankylosaurid from the Lower Cretaceous of eastern Utah, by K. Carpenter, J.I. Kirkland, D. Burge, J. Bird, 2001<\/a>

•Ankylosaurs from the Price River quarries, Cedar Mountain Formation (Lower Cretaceous), east-central Utah, by K. Carpenter, J. Bartlett, J. Bird, and R. Barrick, 2008<\/a>

•Utah's prehistoric tanks-the ankylosaurs, by J.I. Kirkland, 2011<\/a>



<\/div>","classification":"Ornithischia, Thyreophora, Ankylosauria","age":"
1<\/div>\"Middle\" Cretaceous","formation":"Cedar Mountain Formation (Ruby Ranch Member)"},{"dinoName":"Ceratosaurus<\/em><\/strong>","dinoImages":"
Ceratosaurus nasicornis<\/em> on a large skeleton from the Cleveland-Lloyd Dinosaur Quarry at Jurassic National Monument on exhibit at the Natural History Museum of Utah, Salt Lake City.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/ceratosaurus1.jpg\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Ceratosaurus nasicornis<\/em> skeleton from the Cleveland-Lloyd Dinosaur Quarry at Jurassic National Monument on exhibit at the Natural History Museum of Utah, Salt Lake City. Note the osteoderms above each vertebra.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/ceratosaurus2.png\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Ceratosaurus<\/em><\/h4>
Ceratosaurus nasicornis<\/em> was a large but slender predator of the Late Jurassic. The type specimen was essentially the first relatively complete theropod skeleton ever collected. The skull has distinct horns on the top of the head in front of the eyes and a midline horn behind the nares (nasal passages). Given that it also had a row of spines down the ... Read More<\/a>

Ceratosaurus<\/em><\/h4>
Ceratosaurus nasicornis<\/em> was a large but slender predator of the Late Jurassic. The type specimen was essentially the first relatively complete theropod skeleton ever collected. The skull has distinct horns on the top of the head in front of the eyes and a midline horn behind the nares (nasal passages). Given that it also had a row of spines down the midline of its back, display was clearly important for this active meat-eater. Ceratosaurus<\/em> had proportionally larger and more blade-like teeth than its co-occurring rival, Allosaurus<\/em>. Distinct ridged anterior teeth of Ceratosaurus<\/em> have also been found in eastern Africa. Ceratosaurus<\/em> is the last representative of a separate line of large meat-eating dinosaurs in North America that remained important and diversified in the southern hemisphere until the end of the Cretaceous along with the abelosaurs like Carnotarus<\/em> and Majungatholis<\/em>. All of these large carnivores had relatively short skulls and four-fingered hands on short arms.<\/div>","keywords":"saurischia, theropods, theropoda, carnosauria, carnosaurs, Morrison Formation, late jurassic, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•Principal characters of American Jurassic dinosaurs, part VIII, by O.C. Marsh, 1884<\/a>

•Osteology of the carnivorous Dinosauria in the United States National Museum, with special reference to the genera Antrodemus<\/em> (Allosaurus<\/em>) and Ceratosaurus<\/em>, by C.W. Gilmore, 1920<\/a>

•Ceratosaurus<\/em> (Dinosauria, Theropoda)-A revised osteology, by J.H. Madsen and S.P. Welles, 2000<\/a>

•The phylogeny of Ceratosauria (Dinosauria: Theropoda), by M.T. Carrano and S.D. Sampson, 2008<\/a>



<\/div>","classification":"Saurischia, Theropoda, Carnosauridae","age":"
3<\/div>Late Jurassic (163-145 Ma)","formation":"Morrison Formation"},{"dinoName":"Coelophysis<\/em><\/strong>","dinoImages":"
Coelophysis<\/em> from the Late Triassic-age Chinle Formation vs. Megapnosaurus<\/em> from the Jurassic-age Kayenta Formation. These dinosaurs' foot bones are similar enough to make it a challenge to identify which dinosaur would have produced the track fossil Grallator<\/em>.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/coelophysis1.jpg\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Grallator<\/em>-dominated track surface from the Triassic-Jurassic-age Moenave Formation on exhibit at the St. George Dinosaur Discovery Site.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/coelophysis2.png\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Coelophysis<\/em><\/h4>
Coelophysis<\/em> bones, though well-documented from the Upper Triassic Chinle Formation of northern New Mexico and Arizona, have not been convincingly identified in Utah. Vertebra had been identified from southeastern Utah but are not thought to be diagnostic as belonging to a dinosaur. A sacrum has been described from the Chinle Formation near Moab, Uta ... Read More<\/a>

Coelophysis<\/em><\/h4>
Coelophysis<\/em> bones, though well-documented from the Upper Triassic Chinle Formation of northern New Mexico and Arizona, have not been convincingly identified in Utah. Vertebra had been identified from southeastern Utah but are not thought to be diagnostic as belonging to a dinosaur. A sacrum has been described from the Chinle Formation near Moab, Utah, but can only be diagnosed as being a theropod. Theropod tracks referred to as Grallator<\/em> are relatively common throughout the southwest in Upper Triassic through Lower Jurassic strata, but cannot be attributed to Coelophysis<\/em>, particularly in the Lower Jurassic where other coelophysid species could have been the track maker. The discovery of a mass mortality of coelophysids in the Nugget Sandstone near Dinosaur National Monument and excavated by Brigham Young University certainly represents a new species.<\/div>","keywords":"saurischia, theropods, theropoda, coelophysids, coelophysidae, late triassic, early jurassic, Chinle Formation, Nugget Sandstone, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•Small fossil vertebrates from the Chinle Formation (Upper Triassic) of southern Utah, by J.M. Parrish, 1999<\/a>

•The case for fishing dinosaurs at the St. George Dinosaur Discovery site at Johnson Farm, by A.R.C. Milner and J.I. Kirkland, 2007<\/a>

•Rise of the erg-Paleontology and paleoenvironments of the Triassic-Jurassic transition in Northeastern Utah, by B. Brit and D. Chure, 2016<\/a>

•First unambiguous dinosaur specimen from the Upper Triassic Chinle Formation in Utah, by X. Jenkins, J. Foster, and R. Gay, 2017<\/a>



<\/div>","classification":"Saurischia, Theropoda, Coelophysidae","age":"
6<\/div>Late Triassic (237-201 Ma), Early Jurassic (201-174 Ma)","formation":"Chinle Formation, Nugget Sandstone"},{"dinoName":"Deinonychus<\/em><\/strong>","dinoImages":"
Deinonychus<\/em> as displayed at the Yale Peabody Museum, New Haven, Connecticut.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/deinonychus1.jpg\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Deinonychus<\/em> teeth and possible Deinonychus<\/em> coprolites.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/deinonychus2.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Deinonychus<\/em> tracks at the Mill Canyon Dinosaur Tracksite near Moab, Utah. Red arrowheads point to tracks.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/deinonychus3.JPG\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Deinonychus<\/em><\/h4>
Deinonychus<\/em> is the best known of North America's dromaeosaurids, or \"raptors.\" It is known from skeletal remains from Montana and Oklahoma. In Utah, it is mostly known from teeth collected in the Ruby Ranch Member of the Cedar Mountain Formation. A partial skeleton was recovered from the Cedar Mountain at Dinosaur National Monument in a layer a bit ... Read More<\/a>

Deinonychus<\/em><\/h4>
Deinonychus<\/em> is the best known of North America's dromaeosaurids, or \"raptors.\" It is known from skeletal remains from Montana and Oklahoma. In Utah, it is mostly known from teeth collected in the Ruby Ranch Member of the Cedar Mountain Formation. A partial skeleton was recovered from the Cedar Mountain at Dinosaur National Monument in a layer a bit younger than the level of previously known specimens and thus, could be a new species. The Utah Geological Survey found some teeth with a partial tenontosaur skeleton at the same stratigraphic level near Capitol Reef. A couple of possible Deinonychus<\/em> coprolites (droppings) were also found. Possible Deinonychid tracks (track name Dromaeosaurpus<\/em>) have been found in the lower Ruby Ranch at the Mill Canyon Dinosaur Tracksite north of Moab, Utah. These tracks are significant as they demonstrate that these dinosaurs walked on only two toes to keep their sickle-claw sharp.<\/div>","keywords":"saurischia, theropods, theropoda, coelurosaurs, coelurosauria, dromaeosaurids, dromaeosauridae, middle Cretaceous, Ruby Ranch Member, Cedar Mountain Formation, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•Osteology of Deinonychus antirrhopus<\/em>, an unusual theropod from the Lower Cretaceous of Montana, by J.H. Ostrom, 1969<\/a>

•Tracking dinosaurs in BLM canyon country, Utah, by R. Hunt-Foster, M. Lockley, A. Milner, J. Foster, N. Matthews, B. Breithaupt, and J. Smith, 2016<\/a>



<\/div>","classification":"Saurischia, Theropoda, Coelurosauria, Dromaeosauridae","age":"
1<\/div>\"Middle\" Cretaceous","formation":"Cedar Mountain Formation (Ruby Ranch Member)"},{"dinoName":"Diabloceratops<\/em><\/strong>","dinoImages":"
Diabloceratops<\/em> by Robert Gaston, Gaston Design Inc., on exhibit during the 2016 Society of Vertebrate Paleontology Meeting.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/diabloceratops1.JPG\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Diabloceratops<\/em> by Brad Wolverton on the cover of UGS Survey Notes<\/em>.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/diabloceratops2.JPG\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Diabloceratops<\/em> in the ceratopsian family tree.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/diabloceratops3.JPG\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Diabloceratops<\/em><\/h4>
Diabloceratops eatoni<\/em> was the first centrosaurid ceratopsian described from Grand Staircase-Escalante National Monument and is one of the most primitive species of centrosaurids known. It is characterized by two long horns curling off the back of its frill. It was discovered by UGS paleontologist Don DeBlieux, who supervised rock sawing the skull ou ... Read More<\/a>

Diabloceratops<\/em><\/h4>
Diabloceratops eatoni<\/em> was the first centrosaurid ceratopsian described from Grand Staircase-Escalante National Monument and is one of the most primitive species of centrosaurids known. It is characterized by two long horns curling off the back of its frill. It was discovered by UGS paleontologist Don DeBlieux, who supervised rock sawing the skull out of the hard sandstone ledge of the Wahweap Formation it was found in and the air lift out of the backcountry. He spent more than 800 hours removing the rock off the skull so that it could then be illustrated and described.<\/div>","keywords":"ornithischia, marginocephalia, ceratopsian, ceratopsidae, centrosaurinae, centrosaurid, late cretaceous, Wahweap Formation, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•New horned-dinosaurs from the Wahweap Formation, Grand Staircase-Escalante National Monument, by J.I. Kirkland and D.D. DeBlieux, 2007<\/a>

•New basal centrosaurine ceratopsian skulls from the Wahweap Formation (Middle Campanian), Grand Staircase-Escalante National Monument, southern Utah, by J.I. Kirkland and D.D. DeBlieux, 2010<\/a>



<\/div>","classification":"Ornithischia, Marginocephalia, Ceratopsia, Centrosaurinae","age":"
0<\/div>Late Cretaceous (100-66 Ma)","formation":"Wahweap Formation"},{"dinoName":"Diplodocus<\/em><\/strong>","dinoImages":"
Diplodocus hallorum<\/em> on exhibit at the Denver Museum of Nature and Science.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/diplodocus1.jpg\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Diplodocus carnegii<\/em> on exhibit at the Utah Field House of Natural History State Park Museum, Vernal, Utah. Photo courtesy of John Foster.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/diplodocus2.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Diplodocus carnegii<\/em> on exhibit at the Utah Field House of Natural History State Park Museum, Vernal, Utah. These would protect the ventral blood vessel from collapse when it reared up on its hind legs to reach high into trees to secure tender vegetation. They are present in all diplodocids like Barosaurus<\/em> and Apatosaurus<\/em>. Photo courtesy of John Foster.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/diplodocus3.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Diplodocus<\/em><\/h4>
Diplodocus<\/em> means \"double-beam\" dinosaur and was named for the unusual support structures beneath its tail (chevrons). It was a long and slender relative of Apatosaurus<\/em>. Diplodocus longus<\/em> was named for a handful of bones from the Felch Quarry in Colorado that most paleontologists now think are not enough to properly define a species ... Read More<\/a>

Diplodocus<\/em><\/h4>
Diplodocus<\/em> means \"double-beam\" dinosaur and was named for the unusual support structures beneath its tail (chevrons). It was a long and slender relative of Apatosaurus<\/em>. Diplodocus longus<\/em> was named for a handful of bones from the Felch Quarry in Colorado that most paleontologists now think are not enough to properly define a species. Several nearly complete skeletons have been found at Dinosaur National Monument in Utah. A supposedly gigantic diplodocid skeleton was described from northern New Mexico as Seismosaurus hallorum<\/em>, but the vertebrae were misinterpreted and the specimen is a smaller, although still large (100 feet), species of Diplodocus<\/em>. Currently, the majority of the skeletons referred to as Diplodocus longus are now referred to as Diplodocus hallorum<\/em>, including the skeletons from Dinosaur National Monument. Casts of an 87-foot skeleton of Diplodocus carnegii<\/em> from southern Wyoming were sent to museums around the world by Andrew Carnegie in the early 1900s, including the last copy made at the Utah Field House of Natural History Museum in Vernal, Utah.<\/div>","keywords":"saurischia, Sauropodomorphs, sauropodomorpha, diplodocids, diplodocidae, late jurassic, Morrison Formation, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•Principal characters of American Jurassic dinosaurs. Part I, by O.C. Marsh, 1878<\/a>

•A specimen-level phylogenetic analysis and taxonomic revision of Diplodocidae (Dinosauria, Sauropoda), by E. Tschopp, O. Mateus, and R.B.J. Benson, 2015<\/a>



<\/div>","classification":"Saurischia, Sauropodomorpha, Diplodocidae","age":"
3<\/div>Late Jurassic (163-145 Ma)","formation":"Morrison Formation"},{"dinoName":"Dryosaurus<\/em><\/strong>","dinoImages":"
Fruitachampsa<\/em> making off with a baby from a Dryosaurus<\/em> nesting site. Illustration by Mike Skepnick.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/dryosaurus1.jpg\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Dryosaurus elderae<\/em> pursued by small Ceratosaurus<\/em> as exhibited at the Carnegie Museum of Natural History in Pittsburgh, Pennsylvania.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/dryosaurus2.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Dryosaurus<\/em><\/h4>
Dryosaurus<\/em> is a common, small, primitive ornithopod from the Jurassic-age Morrison Formation for which, unlike other Morrison dinosaurs, several nesting sites are known. Described as Dryosaurus altus<\/em> at the end of the 19th century, a second species Dryosaurus elderae<\/em> was made for the specimens from Dinosaur National Monument. Addit ... Read More<\/a>

Dryosaurus<\/em><\/h4>
Dryosaurus<\/em> is a common, small, primitive ornithopod from the Jurassic-age Morrison Formation for which, unlike other Morrison dinosaurs, several nesting sites are known. Described as Dryosaurus altus<\/em> at the end of the 19th century, a second species Dryosaurus elderae<\/em> was made for the specimens from Dinosaur National Monument. Additionally, closely related species are recognized in the Upper Jurassic and Lower Cretaceous strata of Europe and East Africa.<\/div>","keywords":"ornithischia, ornithopoda, iguanodontia, late jurassic, Morrison Formation, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•The typical Ornithopoda of the American Jurassic, by O.C. Marsh, 1894<\/a>

•The ornithopod dinosaur Dryosaurus and a Laurasia-Gondwana connection in the Upper Jurassic, by P.M. Galton, 1977<\/a>

•A photo documentation of bipedal ornithischian dinosaurs from the Upper Jurassic Morrison Formation, USA by K. Carpenter and P. Galton, 2018<\/a>



<\/div>","classification":"Ornithischia, Ornithopoda, Iguanodontia","age":"
3<\/div>Late Jurassic (163-145 Ma)","formation":"Morrison Formation"},{"dinoName":"Dystrophaeus<\/em><\/strong>","dinoImages":"
Dystrophaeus<\/em> bones in the Report Upon U.S. Geographic Surveys West of the 100th Meridian<\/em>, United States Government.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/dystrophaeus1.jpg\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Dystrophaeus<\/em> site.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/dystrophaeus2.JPG\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Dystrophaeus<\/em><\/h4>
Dystrophaeus viaemalae<\/em> is not a very well known sauropod dinosaur, but it holds a number of noteworthy records. Discovered by Dr. John Newberry south of Moab, Utah, on the 1859 Macomb Expedition and described by Edward Drinker Cope in 1877, it was the first dinosaur discovered in western North America. From the basal Tidwell Member of the Jurassic-a ... Read More<\/a>

Dystrophaeus<\/em><\/h4>
Dystrophaeus viaemalae<\/em> is not a very well known sauropod dinosaur, but it holds a number of noteworthy records. Discovered by Dr. John Newberry south of Moab, Utah, on the 1859 Macomb Expedition and described by Edward Drinker Cope in 1877, it was the first dinosaur discovered in western North America. From the basal Tidwell Member of the Jurassic-age Morrison Formation, it is the oldest sauropod known in North America. Cope had mistakenly thought the site was even older, considering it to be Triassic in age. It is also the first type specimen in the collections of the Smithsonian Institution (USNM 2364). The site was lost for more than 100 years until Moab's Fran Barnes' decade of research resulted in his rediscovery of the site in 1988. Utah's State Parks Paleontologist John Foster has reopened the site with the Natural History Museum of Utah leading to the recovery of many additional bones, which will help science get a much better understanding of this important dinosaur.<\/div>","keywords":"Saurischia, Sauropodomorphs, sauropodomorpha, Morrison Formation, Late Jurassic, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•On a dinosaurian from the Trias of Utah, by E.D. Cope, 1877<\/a>

•Origin and early evolution of the sauropod dinosaurs of North America-the type locality and stratigraphic position of Dystrophaeus viaemalae<\/em> Cope 1877, by D.D. Gillette, 1996<\/a>

•The Dystrophaeus Project-It All Started in 1859, by Utah Friends of Paleontology, 2021<\/a>



<\/div>","classification":"Saurischia, Sauropodomorpha","age":"
3<\/div>Late Jurassic (163-145 Ma)","formation":"Morrison Formation"},{"dinoName":"Eolambia<\/em><\/strong>","dinoImages":"
Eolambia<\/em> by Lukas Panzarin.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/eolambia1.JPG\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Eolambia<\/em> jaws in the collections of the Utah State University Eastern Prehistoric Museum, Price.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/eolambia2.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Eolambia<\/em> in the collections of the Utah State University Eastern Prehistoric Museum, Price.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/eolambia3.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Eolambia<\/em> as exhibited at the Utah State University Eastern Prehistoric Museum, Price.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/eolambia4.png\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Eolambia<\/em><\/h4>
Eolambia caroljonesa<\/em> is, by far, the most common dinosaur in the Mussentuchit Member of the Cedar Mountain Formation. This 30-foot-long, bipedal plant eater is a link between the Early Cretaceous Iguanodonts, as it still has a spike for a thumb, and the Late Cretaceous hadrosaurs. It is closely related to the Asian Probactrosaurus<\/em> and its p ... Read More<\/a>

Eolambia<\/em><\/h4>
Eolambia caroljonesa<\/em> is, by far, the most common dinosaur in the Mussentuchit Member of the Cedar Mountain Formation. This 30-foot-long, bipedal plant eater is a link between the Early Cretaceous Iguanodonts, as it still has a spike for a thumb, and the Late Cretaceous hadrosaurs. It is closely related to the Asian Probactrosaurus<\/em> and its presence in the uppermost part of the Cedar Mountain Formation helps date the origins of Alaska and the first migration of Asian dinosaurs into North America about 100 million years ago. It is known from the western San Rafael Swell area, where it occurs with early dome-headed pachycephalosaurs, horned dinosaurs, and tyrannosaurs based on fossil teeth. Many new dinosaurs await discovery there.<\/div>","keywords":"ornithischia, ornithopoda, hadrosauroform, middle Cretaceous, Mussentuchit Member, Cedar Mountain Formation, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•A new hadrosaurid from the upper Cedar Mountain Formation (Albian-Cenomanian: Cretaceous) of eastern Utah-the oldest known hadrosaurid (lambeosaurine?), by J.I. Kirkland, 1998<\/a>

•Osteology of the Basal Hadrosauroid Eolambia caroljonesa<\/em> (Dinosauria: Ornithopoda) from the Cedar Mountain Formation of Utah, by A.T. McDonald, J. Bird, J.I. Kirkland, P. Dodson, 2012<\/a>



<\/div>","classification":"Ornithischia, Ornithopoda, Hadrosauromorpha","age":"
1<\/div>\"Middle\" Cretaceous","formation":"Cedar Mountain Formation (Mussentuchit Member)"},{"dinoName":"Falcarius<\/em><\/strong>","dinoImages":"
Falcarius utahensis<\/em> exhibit at the John Wesley Powell River History Museum in Green River, Utah.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/falcarius1.jpg\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Falcarius<\/em><\/h4>
Falcarius utahensis<\/em> was the first dinosaur to be described from the Lower Yellow Cat Member dinosaur fauna, and as it is somewhat older than 136 million years old, is the oldest therizinosaur in the world. Therizinosaurids are an unusual group of plant-eating theropods best known from Asia that had a more upright posture than other theropods with a ... Read More<\/a>

Falcarius<\/em><\/h4>
Falcarius utahensis<\/em> was the first dinosaur to be described from the Lower Yellow Cat Member dinosaur fauna, and as it is somewhat older than 136 million years old, is the oldest therizinosaur in the world. Therizinosaurids are an unusual group of plant-eating theropods best known from Asia that had a more upright posture than other theropods with a long neck and small skull. Falcarius<\/em> is important because it is a transition from its predatory ancestors to its larger, herbivorous descendants. The type locality is a bonebed south of Green River, Utah, that preserves hundreds of animals. A second locality was found about a mile to the north at a higher stratigraphic level and may preserve a second species. Additionally, a large therizinosaur tooth was found in the lower Yellow Cat 30 miles to the east at Doellings Bowl.<\/div>","keywords":"saurischia, theropods, theropoda, coelurosaurs, coelurosauria, therizinosaurs, therizinosauria, late cretaceous, lower Yellow Cat Member, Cedar Mountain Formation, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•Killer dinos turned vegetarian: Falcarius utahensis<\/em>, by the Utah Geological Survey, 2005<\/a>

•A primitive therizinosauroid dinosaur from the Early Cretaceous of Utah, by J.I. Kirkland, L.E. Zanno, S.D. Sampson, J.M. Clark, and D.D. DeBlieux, 2005<\/a>

•Utah's dinosaur graveyard (video), by the Science Channel, 2007<\/a>

•Osteology of Falcarius utahensis<\/em> (Dinosauria: Theropoda)-characterizing the anatomy of basal therizinosaurs, by L.E. Zanno, 2010<\/a>



<\/div>","classification":"Saurischia, Theropoda, Coelurosauria, Therizinosauria","age":"
0<\/div>Late Cretaceous (100-66 Ma)","formation":"Cedar Mountain Formation (Yellow Cat Member)"},{"dinoName":"Gastonia<\/em><\/strong>","dinoImages":"
Gastonia burgei<\/em> at the Museum of Ancient Life at Thanksgiving Point in Lehi, Utah. Photo courtesy of Jim Kirkland.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/gastonia1.jpg\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Gastonia burgei<\/em> skull at the Utah State University Eastern Prehistoric Museum in Price, Utah.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/gastonia2.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Gastonia lorriemcwhinneyae<\/em> in collections of the Denver Museum of Nature and Science.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/gastonia3.JPG\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Gastonia<\/em><\/h4>
Gastonia burgei<\/em> is an armored dinosaur known as an ankylosaur, specifically it is a polacanthid ankylosaur. It was the first polacanthid ankylosaur for which their distinctive triangular skull became known. It had a low-slung tank-like body covered by armor with rows of spines sticking up above and to the sides off its shoulders. It also had triangu ... Read More<\/a>

Gastonia<\/em><\/h4>
Gastonia burgei<\/em> is an armored dinosaur known as an ankylosaur, specifically it is a polacanthid ankylosaur. It was the first polacanthid ankylosaur for which their distinctive triangular skull became known. It had a low-slung tank-like body covered by armor with rows of spines sticking up above and to the sides off its shoulders. It also had triangular blades running down each side of its tail. Probably the best protected of all the armored dinosaurs, Gastonia<\/em> was likely nearly immune to attacks by Utahraptor<\/em>. It is common in the Yellow Cat Member at the base of the Cedar Mountain Formation around Arches National Park. At least five other kinds of polacanthids are known from the lower Cedar Mountain Formation. A second species of Gastonia<\/em> was described from an ankylosaur bone bed in the overlying Poison Strip Member of the Cedar Mountain Formation. Differences in the braincase, the presence of splates (plates with spines not known in Gastonia burgei<\/em>), and more elongate spines on the back and elongate plates along the sides of the tail suggest that \"Gastonia\" lorriemcwhinneyae<\/em> might best be assigned to another genus of polacanthid.<\/div>","keywords":"ornithischia, Armored Dinosaurs, Thyreophorans, thyreophora, Ankylosaurid, ankylosauria, Polacanthids, polacanthinae, late cretaceous, Yellow Cat Member, Cedar Mountain Formation, Poison Strip Member, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•A polacanthine ankylosaur (Ornithischia: Dinosauria) from the Early Cretaceous (Barremian) of eastern Utah, by J.I. Kirkland, 1998<\/a>

•Utah's prehistoric tanks-the ankylosaurs, by J.I. Kirkland, 2011<\/a>



<\/div>","classification":"Ornithischia, Thyreophora, Ankylosauria, Nodosauridae, Polacanthinae","age":"
0<\/div>Late Cretaceous (100-66 Ma)","formation":"Cedar Mountain Formation (Yellow Cat and Poison Strip Members)"},{"dinoName":"Gryposaurus<\/em><\/strong>","dinoImages":"
Gryposaurus notabilis<\/em> type skull (NMC 2278) in collections of the National Museum of Canada.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/gryposaurus1.jpg\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Gryposaurus monumentensis<\/em> (RAM 6797) in the collections of the Raymond Alf Museum at the Webb Schools, Claremont, California. Photo courtesy of Utah Museum of Natural History.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/gryposaurus2.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Gryposaurus monumentensis<\/em> on exhibit at the Natural History Museum of Utah, Salt Lake City. Photo courtesy of Utah Museum of Natural History.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/gryposaurus3.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Gryposaurus monumentensis<\/em> on exhibit at the Natural History Museum of Utah, Salt Lake City. Photo courtesy of Utah Museum of Natural History.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/gryposaurus4.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Gryposaurus<\/em><\/h4>
Gryposaurus<\/em> is a distinctive hadrosaurine hadrosaur that is best known for its \"Roman nose.\" Gryposaurus notabilis<\/em> was described in 1914 and is rather common in the lower part of the Dinosaur Park Formation in southern Alberta. Following the creation of Grand Staircase-Escalante National Monument, one of the first dinosaurs described from t ... Read More<\/a>

Gryposaurus<\/em><\/h4>
Gryposaurus<\/em> is a distinctive hadrosaurine hadrosaur that is best known for its \"Roman nose.\" Gryposaurus notabilis<\/em> was described in 1914 and is rather common in the lower part of the Dinosaur Park Formation in southern Alberta. Following the creation of Grand Staircase-Escalante National Monument, one of the first dinosaurs described from the Kaiparowits Formation was the more robust Gryposaurus monumentensis<\/em>. It has also proven to be rather common, and because it was up to 40 feet long, it may have been the largest dinosaur living in the Kaiparowits tropical lowland environment. Extensive skin and dorsal scale impressions have been found, clearly indicating that it had a midline row of large scales down its back.<\/div>","keywords":"ornithischia, ornithopoda, hadrosaurid, hadrosauridae, saurolophinae, late cretaceous, Kaiparowits Formation, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•On Gryposaurus notabilis<\/em>, a new genus and species of trachodont dinosaur from the Belly River Formation of Alberta, with a description of the skull of Chasmosaurus bell<\/em>, by L.M. Lambe, 1914<\/a>

•Meet the hadrosaur, Gryposaurus monumentensis by Alf Museum of Paleontology, 2021<\/a>

•A new species of Gryposaurus<\/em> (Dinosauria: Hadrosauridae) from the late Campanian Kaiparowits Formation, southern Utah, USA, by T.A. Gates, and S.D. Sampson, 2007<\/a>



<\/div>","classification":"Ornithischia, Ornithopoda, Hadrosauridae, Saurolophinae","age":"
0<\/div>Late Cretaceous (100-66 Ma)","formation":"Kaiparowits Formation"},{"dinoName":"Hagryphus<\/em><\/strong>","dinoImages":"
Hargryphus<\/em>. Illustration by Michael Skrepnick.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/hagryphus1.jpg\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Hargryphus<\/em> hand (UMNH VP 12765) as preserved before being extracted from its plaster jacket. Now reconstructed and on display at the Natural History Museum of Utah, Salt Lake City.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/hagryphus2.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Megelongatoolithus<\/em>).\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/hagryphus3.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Hagryphus<\/em><\/h4>
Oviraptors are toothless, often crested feathered dinosaurs, which until recently were mostly known from Asia. However, they are represented in North America from the Lower Cretaceous until the terminal Cretaceous extinction by large forms known as caenagnathids. The only caenignathid known in Asia is the huge 30-foot Gigantoraptor<\/em>. Hagryphus gi ... Read More<\/a>

Hagryphus<\/em><\/h4>
Oviraptors are toothless, often crested feathered dinosaurs, which until recently were mostly known from Asia. However, they are represented in North America from the Lower Cretaceous until the terminal Cretaceous extinction by large forms known as caenagnathids. The only caenignathid known in Asia is the huge 30-foot Gigantoraptor<\/em>. Hagryphus giganteus<\/em> was described in 2005 from a complete hand and partial foot. Recently, remains of a huge caenagnathid were found in the Mussentuchit Member of the Cedar Mountain Formation in rocks about 25 million years older than the Kaiparowits Formation preserving Hargryphus<\/em>. In these same strata, the North Carolina Museum of Natural History has recovered partial nests that almost certainly pertain to this giant.<\/div>","keywords":"saurischia, theropods, theropoda, coelurosaurs, coelurosauria, oviraptoridae, oviraptorids, late cretaceous, Kaiparowits Formation, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•A new oviraptorosaur (Theropoda, Maniraptora) from the Late Cretaceous (Campanian) of Utah, by L.E. Zanno and S.D. Sampson, 2005<\/a>

•Rare dinosaur egg nest, discovered by Museum paleontologist, recovered by helicopter (video), by the North Carolina Museum of Natural Sciences, 2018<\/a>



<\/div>","classification":"Saurischia, Theropoda, Coelurosauria, Oviraptoridae","age":"
0<\/div>Late Cretaceous (100-66 Ma)","formation":"Kaiparowits Formation"},{"dinoName":"Haplocanthosaurus<\/em><\/strong>","dinoImages":"
Haplocanthosaurus<\/em> (FHPR 1106) as exhibited at the Utah Field House of Natural History State Park Museum, Vernal, Utah. The missing skull would be at the bottom of the photo. Photo courtesy of Jens Lallensack.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/haplocanthosaurus1.jpg\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Haplocanthosaurus delfsi<\/em> (CMNH 10380) as exhibited at the Cleveland Museum of Natural History, Ohio.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/haplocanthosaurus2.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Haplocanthosaurus<\/em><\/h4>
Haplocanthosaurus<\/em> is a relatively poorly known dinosaur species from the lower Morrison Formation. Most specimens have been recovered from Colorado, but a beautiful skeleton was collected near Dinosaur National Monument in the Salt Wash Member of the Jurassic-age Morrison Formation and is awaiting description. No specimens have been found with a sku ... Read More<\/a>

Haplocanthosaurus<\/em><\/h4>
Haplocanthosaurus<\/em> is a relatively poorly known dinosaur species from the lower Morrison Formation. Most specimens have been recovered from Colorado, but a beautiful skeleton was collected near Dinosaur National Monument in the Salt Wash Member of the Jurassic-age Morrison Formation and is awaiting description. No specimens have been found with a skull and the only specimen complete enough to mount is the holotype of Haplocanthosaurus dellfsi<\/em> at the Cleveland Museum of Natural History. Haplocanthosaurus<\/em> may be the smallest Morrison Formation sauropod species. This skeleton was excavated on the side of a river that posed a constant challenge to the excavators. Recent studies have suggested that it may be the most primitive known diplodocid.<\/div>","keywords":"saurischia, Sauropodomorphs, sauropodomorpha, diplodocids, diplodocidae, late jurassic, Morrison Formation, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•Osteology of Haplocanthosaurus<\/em>, with description of a new species, and remarks on the probable habits of the Sauropoda and the age and origin of the Atlantosaurus Beds, by J.B. Hatcher, 1903<\/a>

•A new species of sauropod dinosaur, Haplocanthosaurus delfsi<\/em> sp. nov., from the Upper Jurassic Morrison Fm. of Colorado, by J.S. McIntosh and M.E. Williams, 1988<\/a>

•Haplocanthosaurus<\/em> (Saurischia: Sauropoda) from the lower Morrison Formation (Upper Jurassic) near Snowmass, Colorado, by J.R. Forster and M.J. Wedel, 2014<\/a>



<\/div>","classification":"Saurischia, Sauropodomorpha, Diplodocidae","age":"
3<\/div>Late Jurassic (163-145 Ma)","formation":"Morrison Formation"},{"dinoName":"Hippodraco ottingeri<\/em><\/strong>","dinoImages":"
\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Hippodraco skull<\/em> in the collections of the Natural History Museum of Utah, Salt Lake City, with reconstruction of skull by Robert Gaston, Gaston Design Inc.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/hippodraco2.JPG\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Hippodraco<\/em> found with juvenile type specimen in the collections of the Natural History Museum of Utah, Salt Lake City. Note the short, squared-off neural spines and the longer chevron bones below the vertebrae.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/hippodraco3.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Hippodraco ottingeri<\/em><\/h4>
Although a considerable diversity of iguanodonts apparently coexisted during deposition of the upper Yellow Cat Member of the Cretaceous-age Cedar Mountain Formation, Hippodraco ottingeri<\/em> is still the only taxon described. Although the type specimen is small, there is good evidence that it got as large as 30 feet long. Originally described as Hi ... Read More<\/a>

Hippodraco ottingeri<\/em><\/h4>
Although a considerable diversity of iguanodonts apparently coexisted during deposition of the upper Yellow Cat Member of the Cretaceous-age Cedar Mountain Formation, Hippodraco ottingeri<\/em> is still the only taxon described. Although the type specimen is small, there is good evidence that it got as large as 30 feet long. Originally described as Hippodraco scutodens<\/em>, it is probably the same species as was originally described as \"Iguanodon\" ottingeri<\/em>. Like other iguanodonts, it was a bipedal plant eater with a distinctive thumb spike. Its short, squared-off neural spines distinguish it from other contemporary species like the large sail-backed taxon excavated by Brigham Young University in the Dalton Wells Quarry at Utahraptor State Park.<\/div>","keywords":"ornithischia, ornithopoda, iguanodontia, early cretaceous, Yellow Cat Member, Cedar Mountain Formation, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•New basal Iguanodonts from the Cedar Mountain Formation of Utah and the evolution of thumb-spiked dinosaurs, by A.T. McDonald, J.I. Kirkland, D.D. DeBlieux, S.K. Madsen, J. Cavin, and others, 2010<\/a>

•A large, tall-spined iguanodontid dinosaur from the Early Cretaceous (Early Albian) basal Cedar Mountain Formation of Utah, by R. Scheetz, B. Britt, and J. Higgerson 2010



<\/div>","classification":"Ornithischia, Ornithopoda, Iguanodontia","age":"
2<\/div>Early Cretaceous (145-100 Ma)","formation":"Cedar Mountain Formation (Yellow Cat Member)"},{"dinoName":"Iguanacolossus<\/em><\/strong>","dinoImages":"
Iquanacolossus<\/em> type by Lukas Panzarin.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/iguanacolossus1.jpg\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Iguanacolossus<\/em> in the collections of the Natural History Museum of Utah, Salt Lake City. Scale is one centimeter.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/iguanacolossus2.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Hippodraco<\/em> versus some juvenile humerus specimens possibly representing Iguanacolossus<\/em> from Doellings Bowl. These are housed in the collections of the Natural History Museum of Utah, Salt Lake City.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/iguanacolossus3.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Iguanocolossus<\/em> from Doellings Bowl in the collections of the Natural History Museum of Utah, Salt Lake City.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/iguanacolossus4.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Iguanacolossus<\/em><\/h4>
Iguanacolossus fortis<\/em> is the oldest iguanodont with a thumb spike known in North America. It was discovered in the lower Yellow Cat Member of the Cedar Mountain Formation. The original specimen was found by UGS paleontologists south of Green River, Utah. We think that it got more than 30 feet long. One of its distinctive characters is that the lower ... Read More<\/a>

Iguanacolossus<\/em><\/h4>
Iguanacolossus fortis<\/em> is the oldest iguanodont with a thumb spike known in North America. It was discovered in the lower Yellow Cat Member of the Cedar Mountain Formation. The original specimen was found by UGS paleontologists south of Green River, Utah. We think that it got more than 30 feet long. One of its distinctive characters is that the lower anterior pelvic bone, the pubis, has a blade that turns up. This character is also seen in iguanodont skeletons that are abundant in another UGS excavation called Doellings Bowl located in similar strata 30 miles to the east of Green River. This shared character may show that they are the same species or it may be a primitive character shared by their ancestors which cannot be used to unite them. Once again, more research is needed by our next generation of paleontologists.<\/div>","keywords":"ornithischia, ornithopoda, iguanodontia, early cretaceous, Yellow Cat Member, Cedar Mountain Formation, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•New basal Iguanodonts from the Cedar Mountain Formation of Utah and the evolution of thumb-spiked dinosaurs, by A.T. McDonald, J.I. Kirkland, D.D. DeBlieux, S.K. Madsen, J. Cavin, and others, 2010<\/a>

<\/div>","classification":"Ornithischia, Ornithopoda, Iguanodontia","age":"
2<\/div>Early Cretaceous (145-100 Ma)","formation":"Cedar Mountain Formation (Yellow Cat Member)"},{"dinoName":"Kosmoceratops<\/em><\/strong>","dinoImages":"
Kosmoceratops<\/em> skeleton fabricated by Robert Gaston, Gaston Design Inc.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/kosmoceratops1.jpg\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Kosmoceratops<\/em> type skull (UMNH VP 17000) in the collections of the Natural History Museum of Utah, Salt Lake City.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/kosmoceratops2.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Kosmoceratops<\/em><\/h4>
Kosmoceratops richardsoni<\/em> is probably the most impressive ceratopsian discovered in the Kaiparowits Formation of Grand Staircase-Escalante National Monument. Its frill is shorter with small parietal openings as compared to any chasmosaurines other than Triceratops<\/em>. It has a blade-like narial horn with larger brow horns that flex laterally. ... Read More<\/a>

Kosmoceratops<\/em><\/h4>
Kosmoceratops richardsoni<\/em> is probably the most impressive ceratopsian discovered in the Kaiparowits Formation of Grand Staircase-Escalante National Monument. Its frill is shorter with small parietal openings as compared to any chasmosaurines other than Triceratops<\/em>. It has a blade-like narial horn with larger brow horns that flex laterally. However, its most distinguishing character is the splay of horns that flex forward over the parietal openings. The \"Elvis'' of ceratopsians, it has the most horns of them all.<\/div>","keywords":"ornithischia, marginocephalia, ceratopsian, ceratopsidae, chasmosaurinae, chasmosaurid, late cretaceous, Kaiparowits Formation, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•New horned dinosaurs from Utah provide evidence for intracontinental dinosaur endemism, by S.D. Sampson, M.A. Loewen, A.A. Farke, E.M. Roberts, C.A. Forster, J.A. Smith, A.L. Titus, 2010<\/a>

<\/div>","classification":"Ornithischia, Marginocephalia, Ceratopsia, Chasmosaurinae","age":"
0<\/div>Late Cretaceous (100-66 Ma)","formation":"Kaiparowits Formation"},{"dinoName":"Lythronax<\/em><\/strong>","dinoImages":"
Lythronax<\/em> as exhibited at the Natural History Museum of Utah, Salt Lake City.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/lythronax1.jpg\">\r\n\t\t\t\"\"\t\r\n\t\t\t\r\n\t\t\t\t<\/span>\r\n\t\t\t<\/span>\r\n\t\t<\/a><\/div>","dinoDescription":"

Lythronax<\/em><\/h4>
Lythronax argestes<\/em> was described from the Cretaceous-age Wahweap Formation on the southern Kaiparowits Plateau in 2013. Together with the younger Tetraphoneus<\/em>, Lythronax<\/em> seems to be part of a group of shorter skull tyrannosaurines closer to Tyrannosaurus<\/em> than the contemporaneous albertosaurines of southwestern Canada.","keywords":"saurischia, theropods, theropoda, coelurosaurs, coelurosauria, tyrannosaurids, tyrannosauridae, late cretaceous, Wahweap Formation, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•Tyrant dinosaur evolution tracks the rise and fall of Late Cretaceous oceans, by M.A. Loewen, R.B. Irmis, J.J.W. Sertich, P.J. Currie, and S.D. Sampson, 2013<\/a>

<\/div>","classification":"Saurischia, Theropoda, Coelurosauria, Tyrannosauridae","age":"
0<\/div>Late Cretaceous (100-66 Ma)","formation":"Wahweap Formation"},{"dinoName":"Machairoceratops<\/em><\/strong>","dinoImages":"
Machairoceratops<\/em> (UMNH VP 20550) in the collections of the Natural History Museum of Utah, Salt Lake City.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/machairoceratops1.jpg\">\r\n\t\t\t\"\"\t\r\n\t\t\t\r\n\t\t\t\t<\/span>\r\n\t\t\t<\/span>\r\n\t\t<\/a><\/div>","dinoDescription":"

Machairoceratops<\/em><\/h4>
Machairoceratops cronusi<\/em> is a close relative of Diabloceratops<\/em> and was found near the top of the Wahweap Formation. Although known only from a pretty scrappy skull, it documents that the long horns at the back of the frill flexed forward such that they almost touched the tips of the brow horns. As large as a rhino, it would have had to fend ... Read More<\/a>

Machairoceratops<\/em><\/h4>
Machairoceratops cronusi<\/em> is a close relative of Diabloceratops<\/em> and was found near the top of the Wahweap Formation. Although known only from a pretty scrappy skull, it documents that the long horns at the back of the frill flexed forward such that they almost touched the tips of the brow horns. As large as a rhino, it would have had to fend off early tyrannosaurids like Lythronax<\/em>.<\/div>","keywords":"ornithischia, marginocephalia, ceratopsian, ceratopsidae, centrosaurinae, centrosaurid, late cretaceous, Wahweap Formation, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•A new centrosaurine ceratopsid, Machairoceratops cronusi<\/em> gen et sp. nov., from the upper Sand Member of the Wahweap Formation (middle Campanian), southern Utah, by E.K. Lund, P.M. O'Connor, M.A. Loewen, and Z.A. Jinnah, 2016<\/a>

<\/div>","classification":"Ornithischia, Marginocephalia, Ceratopsia, Centrosaurinae","age":"
0<\/div>Late Cretaceous (100-66 Ma)","formation":"Wahweap Formation"},{"dinoName":"Marshosaurus<\/em><\/strong>","dinoImages":"
Marshosaurus<\/em> on exhibit at the Natural History Museum of Utah, Salt Lake City.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/marshosaurus1.jpg\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Marshosaurus<\/em> skull material (DMNS 3812) in the collections of the Denver Museum of Nature and Science.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/ marshosaurus2.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Marshosaurus<\/em><\/h4>
Marshosaurus bicentesimus<\/em> is a medium-size magalosaurid carnosaur described on the U.S. bicentennial from the Cleveland-Lloyd Dinosaur Quarry at Jurassic National Monument. Marshosaurus<\/em> is a relatively rare theropod. A fairly complete specimen (DMNH 3718) was collected by Dinosaur National Monument paleontologists in northwestern Colorado a ... Read More<\/a>

Marshosaurus<\/em><\/h4>
Marshosaurus bicentesimus<\/em> is a medium-size magalosaurid carnosaur described on the U.S. bicentennial from the Cleveland-Lloyd Dinosaur Quarry at Jurassic National Monument. Marshosaurus<\/em> is a relatively rare theropod. A fairly complete specimen (DMNH 3718) was collected by Dinosaur National Monument paleontologists in northwestern Colorado and is now under study at the Denver Museum of Nature and Science. It reached lengths up to 16 feet and was named after O.C. Marsh, the famous 19th century Yale paleontologist.<\/div>","keywords":"saurischia, theropods, theropoda, carnosaurs, carnosauria, Morrison Formation, late jurassic, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•A second new theropod dinosaur from the Late Jurassic of east central Utah, by J.H. Madsen, 1976<\/a>

•New data on the theropod Marshosaurus from the Morrison Formation (Upper Jurassic: Kimmeridgian-Tithonian) of Dinosaur National Monument, by D. Chure, B. Britt, and J.H. Madsen, 1993



<\/div>","classification":"Saurischia, Theropoda, Carnosauria","age":"
3<\/div>Late Jurassic (163-145 Ma)","formation":"Morrison Formation"},{"dinoName":"Mierasaurus<\/em><\/strong>","dinoImages":"
Mierasaurus<\/em> by Mike Skrepnick.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/mierasaurus1.jpg\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Mierasaurus<\/em>.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/mierasaurus2.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Mierasaurus<\/em> as reconstructed by Spanish colleagues of the UGS.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/mierasaurus3.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Mierasaurus<\/em> at Doellings Bowl in 2011. Photo courtesy of Jim Kirkland.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/mierasaurus4.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Mierasaurus<\/em><\/h4>
When described in 2017, Mierasaurus bobyoungi<\/em> was the most complete individual Cretaceous sauropod as well as the oldest (about 140 million years old) Cretaceous sauropod known from North America. The animal had become trapped in the mud during deposition of the basal Cedar Mountain Formation such that the front and hind legs extended down into the ... Read More<\/a>

Mierasaurus<\/em><\/h4>
When described in 2017, Mierasaurus bobyoungi<\/em> was the most complete individual Cretaceous sauropod as well as the oldest (about 140 million years old) Cretaceous sauropod known from North America. The animal had become trapped in the mud during deposition of the basal Cedar Mountain Formation such that the front and hind legs extended down into the rock below the level of the rest of the skeleton. Working with our Spanish colleagues, it was determined that Mierasaurus<\/em> was a turiasaur-a group of sauropods previously only known from the Jurassic strata of Europe. Interestingly, based on the classification of sauropods, Mierasaurus<\/em> is more primitive than any of the many sauropods known in the underlying Jurassic-age Morrison Formation.<\/div>","keywords":"saurischia, Sauropodomorphs, sauropodomorpha, turiasaurs, turiasauria, late cretaceous, Yellow Cat Member, Cedar Mountain Formation, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•The Lower Cretaceous in east-central Utah-The Cedar Mountain Formation and its bounding strata, by J. Kirkland, M. Suarez, C. Suarez, and R. Hunt-Foster, 2016<\/a>

•Descendants of the Jurassic turiasaurs from Iberia found refuge in the Early Cretaceous of western USA, by R. Royo-Torres, P. Upchurch, J.I. Kirkland, D.D. DeBlieux, J.R. Foster, A. Cobos, and L. Alcala, 2017<\/a>



<\/div>","classification":"Saurischia, Sauropodomorpha, Turiasauria","age":"
0<\/div>Late Cretaceous (100-66 Ma)","formation":"Cedar Mountain Formation (Yellow Cat Member)"},{"dinoName":"Moabosaurus<\/em><\/strong>","dinoImages":"
Moabosaurus<\/em> on exhibit at the Brigham Young University (BYU) Paleontology Museum with the head of Mierasaurus<\/em> replacing that of Camerasaurus<\/em>. BYU's Brooks Britt defending his mounted skeleton.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/moabosaurus1.jpg\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Moabosaurs<\/em>. At the bottom is a mount with straight ribs along the neck as in Mierasaurus<\/em> at the Elizabeth Dee Shaw Stewart Museum of Paleontology at the Eccles Dinosaur Park, Ogden, Utah. At the top is the updated mount at Brigham Young University's Paleontological Museum with the correct forked ribs along the neck. Note: both skeletons have Camarasaurus<\/em> skulls.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/moabosaurus2.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Moabosaurus<\/em><\/h4>
Moabosaurus utahensis<\/em> is the most abundant dinosaur in the Dalton Wells quarry at Utahraptor State Park with 18 braincases represented in the collections of the Brigham Young University Paleontology Museum. This sauropod was initially thought to be a titanosaur based on the shape of the bones in its tail and in 2017 was described as a camarasaur. In ... Read More<\/a>

Moabosaurus<\/em><\/h4>
Moabosaurus utahensis<\/em> is the most abundant dinosaur in the Dalton Wells quarry at Utahraptor State Park with 18 braincases represented in the collections of the Brigham Young University Paleontology Museum. This sauropod was initially thought to be a titanosaur based on the shape of the bones in its tail and in 2017 was described as a camarasaur. In describing Mierasaurus<\/em>, it was concluded that Moabosaurus<\/em> was also a turiasaur differing from the older Mierasaurus<\/em> in forked ribs along its neck and in various characters of vertebrae and pelvis.<\/div>","keywords":"saurischia, Sauropodomorphs, sauropodomorpha, turiasaurs, turiasauria, late cretaceous, Yellow Cat Member, Cedar Mountain Formation, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•Taphonomy of debris-flow hosted dinosaur bonebeds at Dalton Wells, Utah (Lower Cretaceous, Cedar Mountain Formation, USA), by B.B. Britt, D.A. Eberth, R.D. Scheetz, B.W. Greenhalgh, and K.L. Stadtman, 2009<\/a>

•Moabosaurus utahensis, n. gen., n. sp.,-A new sauropod from the Early Cretaceous (Aptian) of North America, by B.B. Britt, R.D. Scheetz, M.F. Whiting, and D.R. Wilhite, 2017<\/a>



<\/div>","classification":"Saurischia, Sauropodomorpha, Turiasauria","age":"
0<\/div>Late Cretaceous (100-66 Ma)","formation":"Cedar Mountain Formation (Yellow Cat Member)"},{"dinoName":"Moros<\/em><\/strong>","dinoImages":"
Moros<\/em>.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/moros1.jpg\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Moros<\/em> showing recovered elements from Zanno and others (2019).\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/moros2.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Moros<\/em><\/h4>
Moros intrepidus<\/em> was described from a scrappy partial skeleton from the lower Mussentuchit Member of the Cedar Mountain Formation in 2019. Tyrannosaurid teeth were discovered in the mid-1990s as a result of the extensive screen washing by Rich Cifelli of the University of Oklahoma in the quest for Mussentuchit Formation mammal fossils. These teeth w ... Read More<\/a>

Moros<\/em><\/h4>
Moros intrepidus<\/em> was described from a scrappy partial skeleton from the lower Mussentuchit Member of the Cedar Mountain Formation in 2019. Tyrannosaurid teeth were discovered in the mid-1990s as a result of the extensive screen washing by Rich Cifelli of the University of Oklahoma in the quest for Mussentuchit Formation mammal fossils. These teeth were interpreted as reflecting an immigration event of Asian tyrannosaurids by the presence of smaller, chisel-tipped, D-shaped teeth from the front of the upper jaws. These small tyrannosaurids were in a good position to take over after the final extinction of the large carnosaurs such as Siats<\/em>. In 2022, Moros<\/em> became a star in the Jurassic Park<\/em> movie franchise.<\/div>","keywords":"saurischia, theropods, theropoda, coelurosaurs, coelurosauria, tyrannosaurids, tyrannosauridae, middle Cretaceous, Mussentuchit Member, Cedar Mountain Formation, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•Lower to middle Cretaceous dinosaur faunas of the central Colorado Plateau-a key to understanding 35 million years of tectonics, sedimentology, evolution, and biogeography, by J.I. Kirkland, B.B. Britt, D.L. Burge, K. Carpenter, R. Cifelli, F. DeCourten, J. Eaton, S. Hasiotis, and T. Lawton, 1997<\/a>

•Diminutive fleet-footed tyrannosauroid narrows the 70-million-year gap in the North American fossil record, by L.E. Zanno, R.T. Tucker, A. Canoville, M. Haviv T.A. Gates, and P.J. Makovicky, 2019<\/a>



<\/div>","classification":"Saurischia, Theropoda, Coelurosauria, Tyrannosauridae","age":"
1<\/div>\"Middle\" Cretaceous","formation":"Cedar Mountain Formation (Mussentuchit Member)"},{"dinoName":"Mymoorapelta<\/em><\/strong>","dinoImages":"
Mymoorapelta maysi<\/em> by Robert Gaston, Gaston Design Inc. currently on exhibit at the Museum of Western Colorado's Dinosaur Journey in Fruita, Colorado. Photo courtesy of Jim Kirkland.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/mymoorapelta1.jpg\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Mymoorapelta<\/em> sacrum (LACM 154873) recovered in southeastern Utah exhibiting the distinct ventral depression that helps distinguish Mymoorapelta<\/em> from Gargoyleosaurus<\/em>.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/mymoorapelta2.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Gargoyleosaurus<\/em> as exhibited at the Denver Museum of Nature and Science. Note that even though it appears nearly identical to Mymoorapelta<\/em>, there are numerous differences in the skeleton. Photo courtesy of Jim Kirkland.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/mymoorapelta3.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Mymoorapelta<\/em><\/h4>
After more than 100 years of active exploration, ankylosaurs had not been recognized in the Upper Jurassic Morrison Formation until the description of Mymoorapelta maysi<\/em> in 1993. It was found across the Utah state line in westernmost Colorado. Just five years later, a second type, Gargoyleosaurus<\/em>, was described from Bone Cabin quarry in sou ... Read More<\/a>

Mymoorapelta<\/em><\/h4>
After more than 100 years of active exploration, ankylosaurs had not been recognized in the Upper Jurassic Morrison Formation until the description of Mymoorapelta maysi<\/em> in 1993. It was found across the Utah state line in westernmost Colorado. Just five years later, a second type, Gargoyleosaurus<\/em>, was described from Bone Cabin quarry in southern Wyoming. Since then, 13 ankylosaur sites have been found in the Morrison Formation, of which three are in Utah. Only a partial pelvis (sacrum) collected in southeastern Utah by the Natural History Museum of Los Angeles County can be positively identified to species as Mymoorapelta<\/em>. Given this trend, it is expected that more ankylosaurs will be discovered in Utah.<\/div>","keywords":"ornithischia, Armored Dinosaurs, Thyreophorans, thyreophora, Ankylosaurid, ankylosauria, Polacanthids, polacanthinae, late jurassic, Morrison Formation, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•Skull of a Jurassic ankylosaur (Dinosauria), by K. Carpenter, C. Miles, and K. Cloward, 1998<\/a>

•North America's first pre-Cretaceous ankylosaur (Dinosauria) from the Upper Jurassic Morrison Formation of west Colorado, by J.I. Kirkland and K. Carpenter, 1994<\/a>

•Ankylosaur (Dinosauria) specimens from the Upper Jurassic Morrison Formation, by J.I. Kirkland, K. Carpenter, A.P. Hunt, R.D. Scheetz, 1998<\/a>

•Utah's prehistoric tanks-the Ankylosaurs, by J.I. Kirkland, 2011<\/a>



<\/div>","classification":"Ornithischia, Thyreophora, Ankylosauria, Nodosauridae, Polacanthinae","age":"
3<\/div>Late Jurassic (163-145 Ma)","formation":"Morrison Formation"},{"dinoName":"Nasutoceratops<\/em><\/strong>","dinoImages":"
Nasutoceratops<\/em> on the left compared with older and more primitive Diabloceratops<\/em> on the lower right as exhibited on the wall of skulls at the Natural History Museum of Utah, Salt Lake City.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/nasutoceratops1.jpg\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Nasutoceratops<\/em> skull fabricated by Robert Gaston, Gaston Design Inc.; the original skull (UMNH VP 16800) is in the collections of the Natural History Museum of Utah, Salt Lake City.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/nasutoceratops2.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Nasutoceratops<\/em><\/h4>
Nasutoceratops titusi<\/em> is the only centrosaurine ceratopsian so far discovered in the Kaiparowits Formation of the Grand Staircase-Escalante National Monument. It has a simple frill compared to most centrosaurines bordered by small epiparietal and episquamosal horns. Centrosaurines in the upper part of their range typically have very small brow horns ... Read More<\/a>

Nasutoceratops<\/em><\/h4>
Nasutoceratops titusi<\/em> is the only centrosaurine ceratopsian so far discovered in the Kaiparowits Formation of the Grand Staircase-Escalante National Monument. It has a simple frill compared to most centrosaurines bordered by small epiparietal and episquamosal horns. Centrosaurines in the upper part of their range typically have very small brow horns and a prominent nasal horn, giving them a very rhino-like profile. Nasutoceratops<\/em> has a short and very deep muzzle with barely a hint of a nose horn, but it has huge brow horns that extend laterally before curving forward, giving it more of a bull-like appearance. It has been featured in the Jurassic Park\/World franchise, so it is now well-known to the public.<\/div>","keywords":"ornithischia, marginocephalia, ceratopsian, ceratopsidae, centrosaurinae, centrosaurid, late cretaceous, Kaiparowits Formation, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•A remarkable short-snouted horned dinosaur from the Late Cretaceous (late Campanian) of southern Laramidia, by S.D. Sampson, E.K. Lund, M.A. Loewen, A.A. Farke, and K.E. Clayton, 2013<\/a>

•Battle of Big Rock (video), by Jurassic World, 2019<\/a>



<\/div>","classification":"Ornithischia, Marginocephalia, Ceratopsia, Centrosaurinae","age":"
0<\/div>Late Cretaceous (100-66 Ma)","formation":"Kaiparowits Formation"},{"dinoName":"Nedcolbertia<\/em><\/strong>","dinoImages":"
Nedcolbertia<\/em> (CEUM 5071) as exhibited at the Utah State University Eastern Prehistoric Museum, Price, Utah.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/nedcolbertia1.jpg\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Pustularichnis rebeccahuntfosteri<\/em>; basically the entire site is a fossil.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/nedcolbertia3.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Nedcolbertia<\/em><\/h4>
Nedcolbertia justinhoffmani<\/em>, initially described as a generic primitive coelurosaur, is now more specifically assigned to the Ornithomisauria (bird mimics). In fact, it is one of the oldest and most primitive ornithomimids in the world and, unlike later ornithomimids, still retained teeth. Nearly all of the initial specimens of Nedcolbertia<\/em> ... Read More<\/a>

Nedcolbertia<\/em><\/h4>
Nedcolbertia justinhoffmani<\/em>, initially described as a generic primitive coelurosaur, is now more specifically assigned to the Ornithomisauria (bird mimics). In fact, it is one of the oldest and most primitive ornithomimids in the world and, unlike later ornithomimids, still retained teeth. Nearly all of the initial specimens of Nedcolbertia<\/em> are juveniles represented by hips, legs, and tails that are thought to represent animals trapped in the mud or in mudcracks as a lake system expanded over the fossil soil horizon marking the base of the upper Yellow Cat Member of the Cedar Mountain Formation north of Arches National Park. It was a small, lightly built, predatory dinosaur. Ornithomimids were probably present throughout the Cretaceous in Utah. Tracks are present at the Mill Canyon Dinosaur Tracksite north of Moab in the \"middle\" Cretaceous Ruby Ranch Member of the Cedar Mountain Formation. A foot was described from the Upper Cretaceous Kaiparowits Formation as Ornithomimus velox<\/em>, but this identification is questioned.<\/div>","keywords":"saurischia, theropods, theropoda, ornithomimids, orthomimidae, ornithomimosauria, late cretaceous, Yellow Cat Member, Cedar Mountain Formation, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•A small coelurosaurian theropod from the Yellow Cat Member of the Cedar Mountain Formation (Lower Cretaceous, Barremian) of eastern Utah, by J.I. Kirkland, B.B. Britt, C.H. Whittle, S.K. Madsen, and D.L. Burge, 1998<\/a>

•Redescription of Arundel Clay ornithomimosaur material and a reinterpretation of Nedcolbertia justinhofmanni<\/em> as an \"Ostrich Dinosaur,\" by C.D. Brownstein, 2017<\/a>

•A specimen of Ornithomimus velox (Theropoda, Ornithomimidae) from the terminal Cretaceous Kaiparowits Formation of southern Utah, by F. DeCourten and D. Russell, 1985<\/a>

•Tracking dinosaurs in BLM canyon country, Utah, by R. Hunt-Foster, M. Lockley, A. Milner, J. Foster, N. Matthews, B. Breithaupt, and J. Smith, 2016<\/a>

•Pustularichnis rebeccahuntfosteri<\/em>, a microbially induced sedimentary structure-Early Cretaceous Cedar Mountain Formation, Mill Canyon Dinosaur tracksite, Moab, Utah, by E.L. Simpson, M.C. Wizevich, W.R. Reichard-Flynn, A.M. Keebler, S. Evans, and I. Kuslik, 2022



<\/div>","classification":"Saurischia, Theropoda, Ornithomimosauria","age":"
0<\/div>Late Cretaceous (100-66 Ma)","formation":"Cedar Mountain Formation (Yellow Cat Member)"},{"dinoName":"Nothronychus<\/em><\/strong>","dinoImages":"
Nothronychus<\/em> as compared to the smaller and more primitive Falcarius as exhibited at the Natural History Museum of Utah, Salt Lake City.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/nothronychus1.jpg\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Nothronychus graffami<\/em> carcass drifting offshore in the Tropic Sea. Illustration by Victor O. Leshyk.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/nothronychus2.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Nothronychus graffani<\/em> locality in the Tropic Shale north of Bigwater, Utah.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/nothronychus3.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Nothronychus<\/em><\/h4>
The first Nothronychus<\/em> was recovered from a Zuniceratops<\/em> bonebed from the Moreno Hill Formation near the base of Upper Cretaceous (92 million years old) strata just over the state line in westernmost central New Mexico and was named Nothronychus mckinleyi<\/em> in 2001. Around the same time, Merl Graffam of Bigwater, Utah, found a second ... Read More<\/a>

Nothronychus<\/em><\/h4>
The first Nothronychus<\/em> was recovered from a Zuniceratops<\/em> bonebed from the Moreno Hill Formation near the base of Upper Cretaceous (92 million years old) strata just over the state line in westernmost central New Mexico and was named Nothronychus mckinleyi<\/em> in 2001. Around the same time, Merl Graffam of Bigwater, Utah, found a second specimen in slightly older strata (93 million years old) that had been washed out to sea and was buried in the Tropic Shale, and it was named Nothronychus graffami<\/em> in 2009. Between the two species nearly 100% of Nothronychus<\/em> was represented. Nothronychus<\/em> was a true therizinosaurid weighing 1 to 2 tons, about 20 feet long and walking fully erect, with a shortened tail and a pelvis that expanded outward to support the massive gut needed to digest a vegetarian diet. Its large arms had large raptorial claws that were adapted to reach upward to pull down branches to its small beaked skull. Looking at this dinosaur it is easy to see why a few paleontologists speculated that therizinosaurids were late surviving links between theropods and sauropods.<\/div>","keywords":"saurischia, theropods, theropoda, coelurosaurs, coelurosauria, therizinosaurs, therizinosauria, late cretaceous, Tropic Shale, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•First definitive Therizinosaurid (Dinosauria, Theropoda) from North America, by J.I. Kirkland and D.G. Wolfe, 2001<\/a>

•A new North American therizinosaurid and the role of herbivory in predatory dinosaur evolution, by L.E. Zanno, D.D. Gillette, L.B. Albright, A.L. Titus, 2009<\/a>

•A taxonomic and phylogenetic re-evaluation of Therizinosauria (Dinosauria: Maniraptora), by L.E. Zanno, 2010<\/a>



<\/div>","classification":"Saurischia, Theropoda, Coelurosauria, Therizinosauria","age":"
0<\/div>Late Cretaceous (100-66 Ma)","formation":"Tropic Shale"},{"dinoName":"Parasaurolophus<\/em><\/strong>","dinoImages":"
Parasaurolophus walkeri<\/em> in research collections of the WitmerLab at Ohio University.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/parasaurolophus1.jpg\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Parasaurolophus cyrtocristatus<\/em> in exhibits of the Natural History Museum of Utah, Salt Lake City.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/parasaurolophus2.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Parasaurolophus cyrtocristatus<\/em> from the Kaiparowits Formation. Art by Lukas Panzarin.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/parasaurolophus3.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Parasaurolophus cyrtocristatus<\/em> (RAM 14000) he found. The inserted picture is of the better preserved and prepared left side of the skull in the collections of the Raymond Alf Museum at the Webb Schools, Claremont, California.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/parasaurolophus4.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Parasaurolophus<\/em><\/h4>
Parasaurolophus<\/em> was a large bipedal to quadrupedal herbivore best known for its large trombone-shaped crest. This hollow crest is thought to have been used as a resonating chamber for making low-frequency sounds for communicating with others of its kind. The crest may also have been used for display or for giving it an improved sense of smell. There ... Read More<\/a>

Parasaurolophus<\/em><\/h4>
Parasaurolophus<\/em> was a large bipedal to quadrupedal herbivore best known for its large trombone-shaped crest. This hollow crest is thought to have been used as a resonating chamber for making low-frequency sounds for communicating with others of its kind. The crest may also have been used for display or for giving it an improved sense of smell. There are currently three valid species of Parasaurolophus: P. walkeri, P. tubicen<\/em>, and P. cyrtocristatus<\/em>. Currently, all the many skulls and skeletons of Parasaurolophus<\/em> from the Kaiparowits Formation are tentatively assigned to Parasaurolophus cyrtocristatus<\/em>, but there is still discussion as to them being a new species. A nearly complete growth series for this species has been recovered.<\/div>","keywords":"ornithischia, ornithopoda, hadrosaurid, hadrosauridae, lambeosaurine, lambeosaurinae, late cretaceous, Kaiparowits Formation, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•Parasaurolophus walkeri<\/em>-a new genus and species of trachodont dinosaur, by W.A. Parks, 1922<\/a>

•Hadrosaurian dinosaurs of North America, by R.S. Lull, and N.E. Wright, 1942<\/a>

•Ontogeny in the tube-crested dinosaur Parasaurolophus<\/em> (Hadrosauridae) and heterochrony in hadrosaurids, by A.A. Farke, D.J. Chok, A. Herrero, B. Scolieri, and S. Werning, 2013<\/a>

•Description and rediagnosis of the crested hadrosaurid (Ornithopoda) dinosaur Parasaurolophus cyrtocristatus<\/em> on the basis of new cranial remains, by T.A. Gates, D.C. Evans, and J.J.W. Sertich, 2021<\/a>



<\/div>","classification":"Ornithischia, Ornithopoda, Hadrosauridae, Lambeosaurinae","age":"
0<\/div>Late Cretaceous (100-66 Ma)","formation":"Kaiparowits Formation"},{"dinoName":"Peleroplites<\/em><\/strong>","dinoImages":"
Peleroplites<\/em> dwarfs Gastonia burgei<\/em> in the ankylosaur exhibit at the Utah State University Eastern Prehistoric Museum in Price, Utah. Photo courtesy of Jim Kirkland.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/peleroplites1.jpg\">\r\n\t\t\t\"\"\t\r\n\t\t\t\r\n\t\t\t\t<\/span>\r\n\t\t\t<\/span>\r\n\t\t<\/a><\/div>","dinoDescription":"

Peleroplites<\/em><\/h4>
Peleroplites<\/em> may be even larger than the older Sauropelta<\/em> and also was one of the largest of the nodosaurid ankylosaurs. Its massive neck and shoulder spines were probably used for defense. It is only known from the Price River quarries near the top of the Ruby Ranch Member of the Cedar Mountain Formation, south of Price, Utah, where it occ ... Read More<\/a>

Peleroplites<\/em><\/h4>
Peleroplites<\/em> may be even larger than the older Sauropelta<\/em> and also was one of the largest of the nodosaurid ankylosaurs. Its massive neck and shoulder spines were probably used for defense. It is only known from the Price River quarries near the top of the Ruby Ranch Member of the Cedar Mountain Formation, south of Price, Utah, where it occurs with a second, unrelated giant ankylosaur, Cedarpelta<\/em>.<\/div>","keywords":"ornithischia, Armored Dinosaurs, Thyreophorans, thyreophora, Ankylosaurid, ankylosauria, nodosaurids, nodosauridae, middle Cretaceous, Ruby Ranch Member, Cedar Mountain Formation, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•Ankylosaurs from the Price River quarries, Cedar Mountain Formation (Lower Cretaceous), east-central Utah, by K. Carpenter, J. Bartlett, J. Bird, and R. Barrick, 2008<\/a>

•Utah's prehistoric tanks-the ankylosaurs, by J.I. Kirkland, 2011<\/a>



<\/div>","classification":"Ornithischia, Thyreophora, Ankylosauria, Nodosauridae","age":"
1<\/div>\"Middle\" Cretaceous","formation":"Cedar Mountain Formation (Ruby Ranch Member)"},{"dinoName":"Pleurocoelus<\/em>\/\"Titanosauriformes indet.\"<\/strong>","dinoImages":"
Astrodon<\/em> teeth from the Arundel Formation, Maryland, in the collections of the Smithsonian Museum of Natural History, Washington, D.C.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/pleurocoelus1.jpg\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Pleurocoelus<\/em> bone bed at the base of the Cedar Mountain Formation on the west side of the San Rafael Swell.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/pleurocoelus3.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Pleurocoelus<\/em>\/\"Titanosauriformes indet.\"<\/h4>
There are a variety of titanosauriform sauropod taxa in the \"middle\" Cretaceous upper Cedar Mountain Formation in eastern Utah. The first known, Pleurocoelus<\/em>, was discovered by the University of Utah's Frank DeCourten in 1991 from the Long Walk Quarry at the base of the Ruby Ranch Member. The taxon was described from fragmentary skeletal remains by ... Read More<\/a>

Pleurocoelus<\/em>\/\"Titanosauriformes indet.\"<\/h4>
There are a variety of titanosauriform sauropod taxa in the \"middle\" Cretaceous upper Cedar Mountain Formation in eastern Utah. The first known, Pleurocoelus<\/em>, was discovered by the University of Utah's Frank DeCourten in 1991 from the Long Walk Quarry at the base of the Ruby Ranch Member. The taxon was described from fragmentary skeletal remains by Othniel Charles Marsh in 1888 from the Arundel Formation (112-110 million years ago) in Maryland. However, years earlier in 1865, Joseph Leidy described some sauropod teeth as Astrodon johnstoni<\/em> from these same rocks. Recently, all these Lower Cretaceous sauropod fossils have been reassigned as the titanosauriform sauropod Astrodon johnstoni<\/em>. Other paleontologists reject both names, giving the opinion that none of the fossils are diagnostic. Sadly, to add to the confusion, titanosauriform sauropods with slender \"Astrodon\"<\/em>-like teeth from across the western United States have been referred to as Pleurocoelus<\/em>. Virginia Tidwell at the Denver Museum of Nature and Science is researching the Long Walk quarry fossils, which will almost certainly be assigned to a new species of titanosauriform. The Utah State University Eastern Prehistoric Museum has collected hundreds of titanosauriform bones from the top of the Ruby Ranch Member that await formal description. Tiny sauropod teeth similar to Astrodon<\/em> have been recovered in the quest for Mesozoic-age mammals by the University of Oklahoma in the basal upper (\"middle\") Cretaceous-age Mussentuchit Member of the Cedar Mountain Formation. These animals lived just prior to the local extinction of North American sauropods (about 97 million years ago), before titanosaurs re-entered North America 30 million years later in the form of Alamosaurus<\/em>.<\/div>","keywords":"saurischia, Sauropodomorphs, sauropodomorpha, Titanosauriform, middle Cretaceous, Cedar Mountain Formation, Ruby Ranch Member, Mussentuchet Member, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•Memoir on the extinct reptiles of the Cretaceous formations of the United States, by J. Leidy, 1865<\/a>

•Notice of a new genus of Sauropoda and other new dinosaurs from the Potomac Formation, by O.C. Marsh, 1888<\/a>

•New data on Early Cretaceous dinosaurs from the Long Walk quarry and tracksite, Emery County, Utah, by F.L. DeCourten, 1991<\/a>

•Last evidence of sauropod dinosaurs (Saurischia, Sauropodomorpha) in the North American mid-Cretaceous, by W.D. Maxwell and R.L. Cifelli, 2000<\/a>

•Reassessment of the Early Cretaceous sauropod Astrodon johnstoni<\/em> Leidy 1865 (Titanosauriformes), by K. Carpenter and V. Tidwell, 2005<\/a>

•Early Cretaceous titanosauriform cervical UMNH 21054, or, \"Hello again, beautiful,\" by M. Wedel, 2015<\/a>



<\/div>","classification":"Saurischia, Sauropodomorpha, Titanosauriformes","age":"
1<\/div>\"Middle\" Cretaceous","formation":"Cedar Mountain Formation (Ruby Ranch and Mussentuchet Members)"},{"dinoName":"Rhinorex<\/em><\/strong>","dinoImages":"
Rhinorex condrupus<\/em> (BYU 13258) in the collections of the Brigham Young University Paleontology Museum, Provo, Utah.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/rhinorex1.jpg\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Rhinorex<\/em> skull by Robert Gaston, Gaston Design Inc.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/rhinorex2.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Rhinorex<\/em><\/h4>
Rhinorex condrupus<\/em> is a close relative to Gryposaurus<\/em> and lived at approximately the same time. It was found in 1992 by a group of geology students from the University of California at Riverside while doing a reconnaissance study of the coastal sediments in the Neslen Formation in the central Book Cliffs region of eastern Utah. Extensive sk ... Read More<\/a>

Rhinorex<\/em><\/h4>
Rhinorex condrupus<\/em> is a close relative to Gryposaurus<\/em> and lived at approximately the same time. It was found in 1992 by a group of geology students from the University of California at Riverside while doing a reconnaissance study of the coastal sediments in the Neslen Formation in the central Book Cliffs region of eastern Utah. Extensive skin impressions were preserved with the dinosaur skeleton, and the specimen was collected with oversight by Brigham Young University paleontologists with great care given to preserving the skin. Thus, the dinosaur's skin was described before its skeleton. The description of the skull was overseen by the North Carolina Museum of Natural History, which had a contest for children to come up with a pet name for this dinosaur. The winner was Rhinorex<\/em> (the nose king), which was thought to be so creative it was used for the official generic moniker.<\/div>","keywords":"ornithischia, ornithopoda, hadrosaurid, hadrosauridae, saurolophinae, late cretaceous, Nelsen Formation, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•Hadrosaur skin impressions from the Upper Cretaceous Neslen Formation, Book Cliffs, Utah-morphology and paleoenvironmental context, by B.G. Anderson, R.E. Barrick, M.L. Droser, and K.L. Stadtman, 1999<\/a>

•A new saurolophine hadrosaurid (Dinosauria: Ornithopoda) from the Campanian of Utah, North America, by T.A. Gates and R. Scheetz, 2014<\/a>



<\/div>","classification":"Ornithischia, Ornithopoda, Hadrosauridae, Saurolophinae","age":"
0<\/div>Late Cretaceous (100-66 Ma)","formation":"Nelsen Formation"},{"dinoName":"Sauropelta<\/em><\/strong>","dinoImages":"
Sauropelta edwardsi<\/em> in collections at the American Museum of Natural History (AMNH 3035), New York City. Photo courtesy of Jim Kirkland.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/sauropelta1.jpg\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Sauropelta edwardsi<\/em> on exhibit at the American Museum of Natural History (AMNH 3036), New York City. Photo courtesy of Jim Kirkland.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/sauropelta2.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Sauropelta<\/em> (DMNS 49764) from south of Green River, Utah, in collections of the Denver Museum of Nature and Science.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/sauropelta3.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Sauropelta<\/em><\/h4>
Sauropelta<\/em> was one of the largest of the armored dinosaurs, ranging up to 30-35 feet long. It was a nodosaurid ankylosaur. Its large neck and shoulder spines were probably used for defense. It is the oldest nodosaurid for which relatively complete skeletons are known. Parts of even older fossils similar to Sauropelta<\/em> have been found south o ... Read More<\/a>

Sauropelta<\/em><\/h4>
Sauropelta<\/em> was one of the largest of the armored dinosaurs, ranging up to 30-35 feet long. It was a nodosaurid ankylosaur. Its large neck and shoulder spines were probably used for defense. It is the oldest nodosaurid for which relatively complete skeletons are known. Parts of even older fossils similar to Sauropelta<\/em> have been found south of Green River, Utah, near the base of the Ruby Ranch Member of the Cedar Mountain Formation. Recently, an even larger related species was found near the top of the Ruby Ranch south of Price, Utah.<\/div>","keywords":"ornithischia, Armored Dinosaurs, Thyreophorans, thyreophora, Ankylosaurid, ankylosauria, nodosaurids, nodosauridae, middle Cretaceous, Ruby Ranch Member, Cedar Mountain Formation, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•Stratigraphy and paleontology of the Cloverly Formation (Lower Cretaceous) of the Bighorn Basin area, Wyoming and Montana, by J.H. Ostrom, 1970<\/a>

<\/div>","classification":"Ornithischia, Thyreophora, Ankylosauria, Nodosauridae","age":"
1<\/div>\"Middle\" Cretaceous","formation":"Cedar Mountain Formation (Ruby Ranch Member)"},{"dinoName":"Seitaad<\/em><\/strong>","dinoImages":"
Seitaad<\/em> in the Navajo Sandstone block at the level of his knees.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/seitaad1.jpg\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Seitaad<\/em> from Sertich and Loewen (2010) with recovered bones in white and meter scale.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/seitaad2.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Seitaad<\/em> remains as now exhibited in the Natural History Museum of Utah, Salt Lake City.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/seitaad3.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Otozoum<\/em>) in the Navajo Sandstone at Glen Canyon National Recreation Area. Sadly, in illegally trying to replicate these tracks, the perpetrators made a rim of caulking compound, which is still visible after 20 years.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/seitaad5.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Seitaad<\/em><\/h4>
After being reported to the Natural History Museum of Utah by a hiker exploring Comb Ridge near Bluff, Utah, the cross section of this dinosaur skeleton was initially thought to represent a pterosaur. However, following careful extraction from the hard sandstone, it was identified as Utah's first dinosaur from the Early Jurassic Navajo Sandstone. Named S ... Read More<\/a>

Seitaad<\/em><\/h4>
After being reported to the Natural History Museum of Utah by a hiker exploring Comb Ridge near Bluff, Utah, the cross section of this dinosaur skeleton was initially thought to represent a pterosaur. However, following careful extraction from the hard sandstone, it was identified as Utah's first dinosaur from the Early Jurassic Navajo Sandstone. Named Seitaad ruessi<\/em> in 2010, it was identified as Utah's first prosauropod dinosaur. Prosauropods represent an early diversification of long-necked plant eating dinosaurs close to the origins of Utah's famous giant sauropod dinosaurs of the Late Jurassic. Tracks of this type of dinosaur have long been recognized in Utah from the ancient desert dune fields of Lower Jurassic strata.<\/div>","keywords":"saurischia, sauropodomorpha, sauropodomorphs, prosauropoda, prosauropods, early jurassic, Navajo Sandstone, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•A new basal sauropodomorph dinosaur from the Lower Jurassic Navajo Sandstone of Southern Utah, by J.W. Sertich and M.A. Loewen, 2010<\/a>

<\/div>","classification":"Saurischia, Sauropodomorpha, Prosauropoda","age":"
5<\/div>Early Jurassic (201-174 Ma)","formation":"Navajo Sandstone"},{"dinoName":"Siats<\/em><\/strong>","dinoImages":"
Siats<\/em> standing over a fresh Eolambia kill as a couple of hungry Moros look on. Illustration by Julio Lacerda.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/siats1.jpg\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Siats<\/em> dorsal vertebrae (FMNH PR 27160) in the collections of the Chicago Field Museum of Natural History.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/siats2.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Siats<\/em><\/h4>
Siats meekerorumis<\/em> is a giant allosauroid found near the base of Upper Cretaceous (about 99 to 98 million years old) in the Mussentuchit Member of the Cedar Mountain Formation. It is the youngest allosauroid in North America, overlapping with the earliest occurrences of the tyrannosaurid, Moros<\/em>. This overlap indicates that the Mussentuchit ... Read More<\/a>

Siats<\/em><\/h4>
Siats meekerorumis<\/em> is a giant allosauroid found near the base of Upper Cretaceous (about 99 to 98 million years old) in the Mussentuchit Member of the Cedar Mountain Formation. It is the youngest allosauroid in North America, overlapping with the earliest occurrences of the tyrannosaurid, Moros<\/em>. This overlap indicates that the Mussentuchit records the time interval when North America's endemic fauna became largely displaced by the first immigration of dinosaurs across the Alaska land bridge from Asia. This immigration and extinction set up the basic ecological structure of dinosaur faunas that would characterize North America until their extinction. Large allosauroid carnosaurs are probably present at all levels in the Cedar Mountain Formation based on teeth.<\/div>","keywords":"saurischia, theropods, theropoda, carnosaurs, carnosauria, middle Cretaceous, Mussentuchit Member, Cedar Mountain Formation, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•Neovenatorid theropods are apex predators in the Late Cretaceous of North America, by L.E. Zanno and P.J. Makovicky, 2013<\/a>

<\/div>","classification":"Saurischia, Theropoda, Carnosauria","age":"
1<\/div>\"Middle\" Cretaceous","formation":"Cedar Mountain Formation (Mussentuchit Member)"},{"dinoName":"Stegosaurus<\/em><\/strong>","dinoImages":"
Stegosaurus<\/em> from the Walters and Kissinger mural at Dinosaur National Monument.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/stegosaurus1.jpg\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Stegosaurus<\/em> at the Utah State University Eastern Prehistoric Museum in Price, Utah.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/stegosaurus2.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Stegosaurus<\/em> skull from Garden Park, Colorado, in collections of the Denver Museum of Nature and Science.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/stegosaurus3.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Stegosaurus<\/em><\/h4>
Stegosaurus<\/em>, the plated dinosaur, was one of the major plant-eaters of the Jurassic Period. Most paleontologists believe its triangular bony plates were set in two rows along the backbone in a staggered arrangement. The function of the plates is controversial. Perhaps they were for protection or display, but some paleontologists think that they may ... Read More<\/a>

Stegosaurus<\/em><\/h4>
Stegosaurus<\/em>, the plated dinosaur, was one of the major plant-eaters of the Jurassic Period. Most paleontologists believe its triangular bony plates were set in two rows along the backbone in a staggered arrangement. The function of the plates is controversial. Perhaps they were for protection or display, but some paleontologists think that they may have collected solar radiation for thermal regulation. Its four tail spikes would provide protection from predators such Allosaurus<\/em> and Ceratosaurus<\/em>. Even though it is the state dinosaur of Colorado, it is common in Utah. At Dinosaur National Monument they even found a baby Stegosaurus<\/em>. Sorting through the various species names for Stegosaurus<\/em> has been problematic, but with the ruling that Stegosaurus stenops<\/em> is the type species, things have settled down. Two new stegosaurs have been recognized in Wyoming, Hesperosaurus mjosi<\/em> and Miragaia longicollum<\/em>. More research on Utah stegosaurs is certainly needed.<\/div>","keywords":"ornithischia, Armored Dinosaurs, Thyreophorans, thyreophora, Stegosaurs, stegosauria, late jurassic, Morrison Formation, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•A new order of extinct Reptilia (Stegosauria) from the Jurassic of the Rocky Mountains, by O.C. Marsh, 1877<\/a>

•Osteology of the armored Dinosauria in the United States National Museum, with special reference to the genus Stegosaurus<\/em>, by C.W. Gilmore, 1914<\/a>

•New evidence of shared dinosaur across Upper Jurassic proto-North Atlantic-Stegosaurus<\/em> from Portugal, by F. Escaso, F. Ortega, P. Dantas, E. Malafaia, N.L. Pimentel, X. Pereda-Suberbiola, J.L. Sanz, J.C. Kullberg, M.C. Kullberg, and F. Barriga, 2007<\/a>

•The postcranial skeleton of an exceptionally complete individual of the plated dinosaur Stegosaurus stenops<\/em> (Dinosauria: Thyreophora) from the Upper Jurassic Morrison Formation of Wyoming, U.S.A., by S.C.R. Maidment, C. Brassey, and P.M. Barrett, 2015<\/a>



<\/div>","classification":"Ornithischia, Thyreophora, Stegosauria","age":"
3<\/div>Late Jurassic (163-145 Ma)","formation":"Morrison Formation"},{"dinoName":"Stokesosaurus<\/em><\/strong>","dinoImages":"
Stokesosaurus<\/em> (UMNH 2938) in the collections of the Natural History Museum of Utah, Salt Lake City.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/stokesosaurus1.jpg\">\r\n\t\t\t\"\"\t\r\n\t\t\t\r\n\t\t\t\t<\/span>\r\n\t\t\t<\/span>\r\n\t\t<\/a><\/div>","dinoDescription":"

Stokesosaurus<\/em><\/h4>
Stokesosaurus clevelandi<\/em> was described in 1974 from the Cleveland-Lloyd Dinosaur Quarry at Jurassic National Monument from a small distinctive tyrannosaur illium (UMNH 2938) as the first example of a Jurassic tyrannosaur. The upper hip bone of tyrannosaurs (illium) may be distinguished from other meat-eating dinosaurs by a thickened ridge extending ... Read More<\/a>

Stokesosaurus<\/em><\/h4>
Stokesosaurus clevelandi<\/em> was described in 1974 from the Cleveland-Lloyd Dinosaur Quarry at Jurassic National Monument from a small distinctive tyrannosaur illium (UMNH 2938) as the first example of a Jurassic tyrannosaur. The upper hip bone of tyrannosaurs (illium) may be distinguished from other meat-eating dinosaurs by a thickened ridge extending up the side of the illium above the hip socket. Stokesosaurus<\/em> was a rare carnivorous dinosaur reaching lengths of 10 to 13 feet, and was named for a prominent Utah geologist, the late William Lee Stokes. Similar Upper Jurassic illia in Europe that were initially identified as Stokesosaurus<\/em> have been reassigned to Juratyrant<\/em>. Much remains to be learned about these small Upper Jurassic tyrannosaurs.<\/div>","keywords":"saurischia, theropods, theropoda, coelurosaurs, coelurosauria, tyrannosaurids, tyrannosauridae, late jurassic, Morrison Formation, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•A new theropod dinosaur from the Upper Jurassic of Utah, by J.H. Madsen, 1974<\/a>

<\/div>","classification":"Saurischia, Theropoda, Coelurosauria, Tyrannosauridae","age":"
3<\/div>Late Jurassic (163-145 Ma)","formation":"Morrison Formation"},{"dinoName":"Talos<\/em><\/strong>","dinoImages":"
Talos<\/em> with known bones in red.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/talos1.jpg\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Talos<\/em> (UMNH VP 19479) on exhibit at the Natural History Museum of Utah, Salt Lake City.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/talos2.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Talos<\/em><\/h4>
Troodontids are small, meat-eating dinosaurs recognized throughout the Upper Cretaceous strata of Utah by their distinctive teeth found by wet screen washing of fossiliferous rock. Troodon<\/em> had a small killing claw on its hind foot, which might have been independently developed. These are the most intelligent dinosaurs yet discovered based on the siz ... Read More<\/a>

Talos<\/em><\/h4>
Troodontids are small, meat-eating dinosaurs recognized throughout the Upper Cretaceous strata of Utah by their distinctive teeth found by wet screen washing of fossiliferous rock. Troodon<\/em> had a small killing claw on its hind foot, which might have been independently developed. These are the most intelligent dinosaurs yet discovered based on the size of their brains. A partial skeleton of a small troodontid from the Kaiparowits Formation was described as Talos sampsoni<\/em> in 2011.<\/div>","keywords":"saurischia, theropods, theropoda, coelurosaurs, coelurosauria, troodontids, troodontidae, late cretaceous, Kaiparowits Formation, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•Cretaceous vertebrate faunas of the Kaiparowits Basin (Cenomanian-Campanian), southern Utah, by J.G. Eaton, R.L. Cifelli, J.H. Hutchinson, J.I. Kirkland, and J.M. Parrish, 1999<\/a>

•A new troodontid theropod, Talos sampsoni<\/em> gen. et sp. nov., from the Upper Cretaceous western interior basin of North America, by L.E. Zanno, D.J. Varricchio, P.M. O'Connor, A.L. Titus, and M.J. Knell, 2011<\/a>



<\/div>","classification":"Saurischia, Theropoda, Coelurosauria, Troodontidae","age":"
0<\/div>Late Cretaceous (100-66 Ma)","formation":"Kaiparowits Formation"},{"dinoName":"Tenontosaurus<\/em><\/strong>","dinoImages":"
Tenontosaurus tilletti<\/em> skeleton on exhibit at the Museum of the Rockies, Bozeman, Montana.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/tenontosaurus1.png\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Tenontosaurus tilletti<\/em> (YPM 5456) in collections of the Yale Peabody Museum, New Haven, Connecticut.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/tenontosaurus2.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Tenontosaurus dossi<\/em> (FWMSH 93B 1) on exhibit at the Perot Museum, Dallas, Texas.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/tenontosaurus3.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Tenontosaurus<\/em> from the top of the Ruby Ranch Member on exhibit at the Utah State University Eastern Prehistoric Museum, Price.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/tenontosaurus4.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Tenontosaurus<\/em><\/h4>
Tenontosaurus<\/em> was the most common large bipedal to quadrupedal plant-eater from the later part of the Early Cretaceous of North America. It is thought that following the extinction of the more advanced thumb-spike-bearing Iguanodonts in North America, a small, primitive ornithopod evolved to fill that role in the ecosystem. It is known from the midd ... Read More<\/a>

Tenontosaurus<\/em><\/h4>
Tenontosaurus<\/em> was the most common large bipedal to quadrupedal plant-eater from the later part of the Early Cretaceous of North America. It is thought that following the extinction of the more advanced thumb-spike-bearing Iguanodonts in North America, a small, primitive ornithopod evolved to fill that role in the ecosystem. It is known from the middle and upper part of the Ruby Ranch Member of the Cedar Mountain Formation in the area around the San Rafael Swell. Tenontosaurus<\/em> was later replaced by more advanced ornithopods like Eolambia that migrated into North America from Asia. Tenontosaurus tilletti<\/em> is the most best known species and occurs in strata 111 to 112 million years old. Fossils from Utah attributed to Tenontosaurus<\/em> are fragmentary and are either considerably older (greater than 15 million years old) or much younger (around 104 to 103 million years old) and as such are certainly a related, undescribed species. An older species was described from Texas and named Tenontosaurus dossi<\/em>, which differs markedly by possessing teeth at the front of the upper jaws. An isolated partial skeleton excavated by the UGS from near Capitol Reef National Park had several deinonychid teeth and coprolites associated with it.<\/div>","keywords":"ornithischia, ornithopoda, iguanodontia, \"middle\" Cretaceous, Ruby Ranch Member, Cedar Mountain Formation, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•Stratigraphy and paleontology of the Cloverly Formation (Lower Cretaceous) of the Bighorn Basin area, Wyoming and Montana, by J.H. Ostrom, 1970<\/a>

•The postcranial skeleton of the ornithopod dinosaur Tenontosaurus tilletti<\/em>, by C.A. Forster, 1990<\/a>

•A new species of Tenontosaurus<\/em> (Dinosauria: Ornithopoda) from the Early Cretaceous of Texas, by D.A. Winkler, P.A. Murry, and L.L. Jacobs, 1997<\/a>



<\/div>","classification":"Ornithischia, Ornithopoda, Iguanodontia","age":"
1<\/div>\"Middle\" Cretaceous","formation":"Cedar Mountain Formation (Ruby Ranch Member)"},{"dinoName":"Teratophoneus<\/em><\/strong>","dinoImages":"
Teratophoneus<\/em> adult and juvenile skeletal reconstruction by Robert Gaston, Gaston Design Inc. as exhibited at the Natural History Museum of Utah, Salt Lake City.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/tetraphoneus1.jpg\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Teratophoneus<\/em> in the collections of the Natural History Museum of Utah, Salt Lake City.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/tetraphoneus2.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Teratophoneus<\/em><\/h4>
Teratophoneus curriei<\/em> was initially described from a partial adult skull in the collections of the Brigham Young University Paleontology Museum collection by Tom Carr and others in 2011 soon after a relatively complete juvenile specimen was excavated in the Kaiparowits Formation at Grand Staircase-Escalante National Monument. Subsequently, several a ... Read More<\/a>

Teratophoneus<\/em><\/h4>
Teratophoneus curriei<\/em> was initially described from a partial adult skull in the collections of the Brigham Young University Paleontology Museum collection by Tom Carr and others in 2011 soon after a relatively complete juvenile specimen was excavated in the Kaiparowits Formation at Grand Staircase-Escalante National Monument. Subsequently, several additional skeletons have been recovered. Interestingly, these 30-foot-long tyrannosaurids from Utah are different than those from correlative beds in Montana and southwestern Canada. A tyrannosaurid bone bed was initially thought to be populated by Teratophoneus<\/em>, but now scientists are doing more detailed studies to see if indeed there is a second tyrannosaurid in the Kaiparowits Formation.<\/div>","keywords":"saurischia, theropods, theropoda, coelurosaurs, coelurosauria, tyrannosaurids, tyrannosauridae, late cretaceous, Kaiparowits Formation, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•Evidence for high taxonomic and morphologic tyrannosaurid diversity in the Late Cretaceous (Late Campanian) of the American Southwest and a new short-skulled tyrannosaurid from the Kaiparowits Formation of Utah, by T.D. Carr, T.E. Williamson, B.B. Britt, and K. Stadtman, 2011<\/a>

•Tyrant dinosaur evolution tracks the rise and fall of Late Cretaceous oceans, by M.A., Loewen, R.B., Irmis, J.J.W., Sertich, P.J., Currie, S.D., and Sampson, S.D., 2013<\/a>

•Geology and taphonomy of a unique tyrannosaurid bonebed from the upper Campanian Kaiparowits Formation of southern Utah, by A.L. Titus, K. Knoll, J.J.W. Sertich, D. Yamamura, C.A. Suarez, I.J. Glasspool, J.E. Ginouves, A.K. Lukacic, and E.M. Roberts, 2021<\/a>



<\/div>","classification":"Saurischia, Theropoda, Coelurosauria, Tyrannosauridae","age":"
0<\/div>Late Cretaceous (100-66 Ma)","formation":"Kaiparowits Formation"},{"dinoName":"Torosaurus<\/em><\/strong>","dinoImages":"
Torosaurus latus<\/em> reconstruction at the Milwaukee Public Museum, Wisconsin. Photo courtesy Francois Gohier.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/torosaurus1.jpg\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Torosaurus utahensis<\/em> type skull material (USNM 15583) in the collections of the United States National Museum.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/torosaurus2.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Torosaurus utahensis<\/em> skull material under study at the Utah State University Eastern Prehistoric Museum in Price from what may be the most complete individual known.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/torosaurus3.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Torosaurus<\/em><\/h4>
Torosaurus<\/em> was a three-horned ceratopsian dinosaur that was widespread in North America at the end of the Cretaceous Period. As large as an elephant, its enormous frill was modified from the bones in the rear part of the skull, giving it a skull over 10 feet long (the largest of any land-living animal). Its three horns served to protect the front of ... Read More<\/a>

Torosaurus<\/em><\/h4>
Torosaurus<\/em> was a three-horned ceratopsian dinosaur that was widespread in North America at the end of the Cretaceous Period. As large as an elephant, its enormous frill was modified from the bones in the rear part of the skull, giving it a skull over 10 feet long (the largest of any land-living animal). Its three horns served to protect the front of the body, making even Tyrannosaurus<\/em> think twice about attacking a healthy adult. North and east of Utah, Torosaurus latus<\/em> co-occurs with Triceratops<\/em> at the very end of the Cretaceous. Torosaurus utahensis<\/em> was the first ceratopsian described in Utah (1946) and also occurs in the Big Bend region of Texas, but never with Triceratops<\/em>. Although important Utah specimens are housed at the Smithsonian, Natural History Museum of Utah, and Utah State University Eastern Prehistoric Museum, no reconstructed skulls have ever been made of Utah's largest horned dinosaur.<\/div>","keywords":"ornithischia, marginocephalia, ceratopsian, ceratopsidae, chasmosaurinae, chasmosaurid, late cretaceous, North Horn Formation, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•Reptilian fauna of the North Horn Formation of central Utah, by C.W. Gilmore, 1946<\/a>

•The mysterious Torosaurus, by Riley Black, Smithsonian Magazine, 2011<\/a>

•The record of Torosaurus<\/em> (Ornithischia: Ceratopsidae) in Canada and its taxonomic implications, by J.C. Mallon, R.B. Holmes, E.L. Bamforth, and D. Schumann, 2022<\/a>



<\/div>","classification":"Ornithischia, Marginocephalia, Ceratopsia, Chasmosaurinae","age":"
0<\/div>Late Cretaceous (100-66 Ma)","formation":"North Horn Formation"},{"dinoName":"Torvosaurus<\/em><\/strong>","dinoImages":"
Torvosaurus tanneri<\/em> skeleton by Fossil Logic in Pleasant Grove, Utah, taken from the Brigham Young University type specimen and a new specimen from near Dinosaur, Colorado. Currently on exhibit at the Cincinnati Museum of Natural History.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/torvosaurus1.jpg\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Torvosaurus<\/em> (BYUVP 4882 & 9122). Photo courtesy of Jim Kirkland.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/torvosaurus2.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Torvosaurus<\/em> pelvic bones (pubes) in the collections of the Utah State University Eastern Prehistoric Museum in Price, Utah. These bones are proportionally much smaller than those of Tyrannosaurus<\/em>, which has a massive boot at the end to help support its weight.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/torvosaurus3.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Torvosaurus<\/em><\/h4>
Torvosaurus tanneri<\/em> is the largest Jurassic-age theropod known in Utah. Reaching nearly the size of Tyrannosaurus<\/em>, it was able to terrorize even the giant sauropods. Although rare, it is known from a couple of sites. A second species, Torvosaurus guerneyi<\/em>, was recently discovered in the Upper Jurassic Lourinha Formation on the coas ... Read More<\/a>

Torvosaurus<\/em><\/h4>
Torvosaurus tanneri<\/em> is the largest Jurassic-age theropod known in Utah. Reaching nearly the size of Tyrannosaurus<\/em>, it was able to terrorize even the giant sauropods. Although rare, it is known from a couple of sites. A second species, Torvosaurus guerneyi<\/em>, was recently discovered in the Upper Jurassic Lourinha Formation on the coast of Portugal.<\/div>","keywords":"saurischia, theropods, theropoda, carnosaurs, carnosauria, Morrison Formation, late jurassic, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•A new large theropod dinosaur from the Upper Jurassic of Colorado, by P.M. Galton and J.A. Jensen, 1979<\/a>

•Theropods of Dry Mesa quarry (Morrison Formation, Late Jurassic), Colorado, with emphasis on the osteology of Torvosaurus tanneri, by B. Britt, 1991<\/a>

•Torvosaurus gurneyi<\/em> n. sp., the largest terrestrial predator from Europe, and a proposed terminology of the maxilla anatomy in Nonavian theropods, by C. Hendrickx and O. Mateus, 2014<\/a>



<\/div>","classification":"Saurischia, Theropoda, Carnosauria","age":"
3<\/div>Late Jurassic (163-145 Ma)","formation":"Morrison Formation"},{"dinoName":"Tyrannosaurus<\/em><\/strong>","dinoImages":"
T. rex<\/em> known as Sue as originally exhibited at the Chicago Field Museum.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/tyrannosaurus1.jpg\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Tyrannosaurus rex<\/em> as exhibited at the Natural History Museum of Utah, Salt Lake City. Note: only the light rose-colored bones at the rear of the skull belong to the skull found in the North Horn Formation.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/tyrannosaurus2.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Tyrannosaurus<\/em><\/h4>
Tyrannosaurus rex<\/em>, the most famous of the carnivorous dinosaurs, weighed up to 7 tons. Its serrated, banana-size teeth were used to crush the flesh and bone of its prey. With a massive head and jaws that measured more than 5 feet in length, and a body length of up to 50 feet, adult tyrannosaurs were among the largest of the predatory dinosaurs. One ... Read More<\/a>

Tyrannosaurus<\/em><\/h4>
Tyrannosaurus rex<\/em>, the most famous of the carnivorous dinosaurs, weighed up to 7 tons. Its serrated, banana-size teeth were used to crush the flesh and bone of its prey. With a massive head and jaws that measured more than 5 feet in length, and a body length of up to 50 feet, adult tyrannosaurs were among the largest of the predatory dinosaurs. One of their most distinguishing characters is their rather tiny arms and two fingered hands. They were also among the last dinosaurs, living only during the last couple of million years of the Cretaceous Period. Utah's only T. rex<\/em> was discovered by University of Utah graduate student Rose Difley in the North Horn Formation and is sometimes referred to as \"Rose.\"<\/div>","keywords":"saurischia, theropods, theropoda, coelurosaurs, coelurosauria, tyrannosaurids, tyrannosauridae, late cretaceous, North Horn Formation, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•Tyrannosaurus and other Cretaceous carnivorous dinosaurs, by H.F. Osborn, 1905<\/a>

•Tyrannosaurus rex<\/em> from the Upper Cretaceous (Maastrichtian) North Horn Formation of Utah: biogeographic and paleoecologic implication, by S.D. Sampson and M.A. Loewen, 2005<\/a>



<\/div>","classification":"Saurischia, Theropoda, Coelurosauria, Tyrannosauridae","age":"
0<\/div>Late Cretaceous (100-66 Ma)","formation":"North Horn Formation"},{"dinoName":"Utahceratops<\/em><\/strong>","dinoImages":"
Utahceratops<\/em> fabricated by Robert Gaston, Gaston Design Inc., exhibited at the Natural History Museum of Utah, Salt Lake City.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/utahceratops1.jpg\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Utahceratops<\/em> skull (UMNH VP 16784) with its namesake Mike Getty (left) and Scott Sampson (right).\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/utahceratops2.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Utahceratops<\/em><\/h4>
Utahceratops gettyi<\/em> was the first ceratopsian discovered in the Kaiparowits Formation of Grand Staircase-Escalante National Monument. It is also the most abundant, with at least seven skeletons known. Its three horns are nearly the same length and are relatively short compared to other chasmosaurs. Its brow horns are particularly notable in flexing ... Read More<\/a>

Utahceratops<\/em><\/h4>
Utahceratops gettyi<\/em> was the first ceratopsian discovered in the Kaiparowits Formation of Grand Staircase-Escalante National Monument. It is also the most abundant, with at least seven skeletons known. Its three horns are nearly the same length and are relatively short compared to other chasmosaurs. Its brow horns are particularly notable in flexing laterally. Its closest relatives appear to be in the newly defined southern ceratopsian lineage of Pentaceratops<\/em>.<\/div>","keywords":"ornithischia, marginocephalia, ceratopsian, ceratopsidae, chasmosaurinae, chasmosaurid, late cretaceous, Kaiparowits Formation, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•New horned dinosaurs from Utah provide evidence for intracontinental dinosaur endemism, by S.D. Sampson, M.A. Loewen, A.A. Farke, E.M. Roberts, C.A. Forster, J.A. Smith, A.L. Titus, 2010<\/a>

•Transitional evolutionary forms in chasmosaurine ceratopsid dinosaurs-evidence from the Campanian of New Mexico, by D.W. Fowler, and E.A. Freedman-Fowler, 2020<\/a>



<\/div>","classification":"Ornithischia, Marginocephalia, Ceratopsia, Chasmosaurinae","age":"
0<\/div>Late Cretaceous (100-66 Ma)","formation":"Kaiparowits Formation"},{"dinoName":"Utahraptor<\/em><\/strong>","dinoImages":"
Jurassic World<\/em> (2015).\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/utahraptor1.jpg\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Utahraptor<\/em> pedal slashing-claw in place at the Gaston Quarry, now in the collections of Utah State University Eastern Prehistoric Museum, Price, Utah.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/utahraptor2.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Utahraptor<\/em> slashing-stabbing claw reconstruction with sheaf by Robert Gaston, Gaston Design Inc. (light brown) vs. the smaller sculpted \"velociraptor\" claw (dark brown) as created by the Stan Winston Studio for the Jurassic Park franchise.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/utahraptor3.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Utahraptor<\/em> on the prowl by Jed Taylor.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/utahraptor4.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Utahraptor<\/em><\/h4>
Utahraptor ostrommaysi<\/em> is the dominant large meat-eating dinosaur in the upper part of the Yellow Cat Member of the Cedar Mountain Formation. Utahraptor<\/em>, one of Utah's more famous new dinosaurs and designated as the State dinosaur in 2018, was a sickle-clawed predator that may have hunted in packs. Weighing just under one-half a ton, this m ... Read More<\/a>

Utahraptor<\/em><\/h4>
Utahraptor ostrommaysi<\/em> is the dominant large meat-eating dinosaur in the upper part of the Yellow Cat Member of the Cedar Mountain Formation. Utahraptor<\/em>, one of Utah's more famous new dinosaurs and designated as the State dinosaur in 2018, was a sickle-clawed predator that may have hunted in packs. Weighing just under one-half a ton, this massively built meat-eater was the real-life version of the ferocious oversized Velociraptor<\/em> portrayed in the movie Jurassic Park<\/em>. Utahraptor<\/em> skeletal sites are only known in Grand County in a belt of outcrop along the east and north sides of Arches National Park. Apparently, the geological processes that produced the distinctive rock arches and fins of Arches National Park also created the geological setting to preserve not just the oldest Cretaceous-age dinosaur level, but the two oldest Cretaceous dinosaur faunas known in North America. Mounted skeletons are on display at several museums in Utah. Utahraptor State Park is in development around Brigham Young University's old Dalton Wells quarry where parts of at least eight Utahraptors<\/em> have been found.<\/div>","keywords":"saurischia, theropods, theropoda, coelurosaurs, coelurosauria, dromaeosaurids, dromaeosauridae, late cretaceous, upper Yellow Cat Member, Cedar Mountain Formation, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•A large dromaeosaurid (Theropoda) from the Lower Cretaceous of Eastern Utah, by J.I. Kirkland, D. Burge, and R. Gaston, 1993<\/a>

•A review of dromaeosaurid systematics and paravian phylogeny, by A.H. Turner, P.J. Makovicky, and M.A. Norell, 2012<\/a>



<\/div>","classification":"Saurischia, Theropoda, Coelurosauria, Dromaeosauridae","age":"
0<\/div>Late Cretaceous (100-66 Ma)","formation":"Cedar Mountain Formation (Yellow Cat Member)"},{"dinoName":"Venenosaurus<\/em><\/strong>","dinoImages":"
Venenosaurus<\/em> bones in the collections of the Denver Museum of Nature and Science. Photo courtesy of Kenneth Carpenter.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/venenosaurus1.jpg\">\r\n\t\t\t\"\"\t\r\n\t\t\t\r\n\t\t\t\t<\/span>\r\n\t\t\t<\/span>\r\n\t\t<\/a><\/div>","dinoDescription":"

Venenosaurus<\/em><\/h4>
The brachiosaurid Venenosaurus dicrocei<\/em> was described in 2001 and is the only sauropod taxon so far described from the Poison Strip Member of the Cedar Mountain Formation. Sadly, the age of the Poison Strip is poorly constrained and could be anywhere from 130 to 120 million years. Parts of both an adult and a juvenile were found with the holotype of ... Read More<\/a>

Venenosaurus<\/em><\/h4>
The brachiosaurid Venenosaurus dicrocei<\/em> was described in 2001 and is the only sauropod taxon so far described from the Poison Strip Member of the Cedar Mountain Formation. Sadly, the age of the Poison Strip is poorly constrained and could be anywhere from 130 to 120 million years. Parts of both an adult and a juvenile were found with the holotype of the iguanodont Planacoxa<\/em>. Venenosaurus<\/em> appears to be closest to the Cedarosaurus<\/em> from the underlying Yellow Cat Member.<\/div>","keywords":"saurischia, Sauropodomorphs, sauropodomorpha, brachiosaurids, brachiosauridae, late cretaceous, Poison Strip Member, Cedar Mountain Formation, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•New titanosauriform (Sauropoda) from the Poison Strip Member of the Cedar Mountain Formation (Lower Cretaceous), Utah, by V.C. Tidwell, K. Carpenter, and S. Meyer, 2001<\/a>

•Thunder lizards: The Sauropodomorph dinosaurs-Ontogenetic variation and isometric growth in the forelimb of the Early Cretaceous sauropod Venenosaurus<\/em>, by V. Tidwell and D.R. Wilhite, 2005<\/a>



<\/div>","classification":"Saurischia, Sauropodomorpha, Brachiosauridae","age":"
1<\/div>\"Middle\" Cretaceous","formation":"Cedar Mountain Formation (Ruby Ranch Member)"},{"dinoName":"Yurgovuchia<\/em><\/strong>","dinoImages":"
Yurgovuchia<\/em> contrasted with Utah Geological Survey geologist Hellmut Doelling.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/yurgovuchia1.jpg\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>Utahraptor<\/em> compared with cast of a smaller complete pelvis (light gray) of Yurgovuchia<\/em>.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/yurgovuchia2.jpg\">\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Yurgovuchia<\/em><\/h4>
Yurgovuchia doellingi<\/em> was one of the initial discoveries at the Doellings Bowl bonebed near the base of the Yellow Cat Member of the Cedar Mountain Formation. Yurgovuchia<\/em> is thought to be a smaller, close relative of Utahraptor<\/em>. Yurgovuch is the Ute word for coyote.","keywords":"saurischia, theropods, theropoda, coelurosaurs, coelurosauria, dromaeosaurids, dromaeosauridae, late cretaceous, lower Yellow Cat Member, Cedar Mountain Formation, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•New dromaeosaurids (Dinosauria: Theropoda) from the Lower Cretaceous of Utah, and the evolution of the dromaeosaurid tail, by P. Senter, J.I. Kirkland, D.D. Deblieux, S. Madsen, and N. Toth, 2012<\/a>

<\/div>","classification":"Saurischia, Theropoda, Coelurosauria, Dromaeosauridae","age":"
0<\/div>Late Cretaceous (100-66 Ma)","formation":"Cedar Mountain Formation (Yellow Cat Member)"},{"dinoName":"Utah pachycephalosaurs<\/strong>","dinoImages":"
\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Utah pachycephalosaurs<\/h4>
Several species of the dome-headed pachycephalosaurs are known from Utah although none of these has been formally described as of yet. These dome headed-dinosaurs were born with a normal head, often with a spray of horns around the back of the skull, but as they grew the bony horn-cores shrunk and the solid bony dome formed. It was once thought that they mig ... Read More<\/a>

Utah pachycephalosaurs<\/h4>
Several species of the dome-headed pachycephalosaurs are known from Utah although none of these has been formally described as of yet. These dome headed-dinosaurs were born with a normal head, often with a spray of horns around the back of the skull, but as they grew the bony horn-cores shrunk and the solid bony dome formed. It was once thought that they might compete by head butting, but most scientists speculate that flank butting or head slashing similar to giraffes is more likely.<\/div>","keywords":"ornithischia, marginocephalia, pachycephalosaurs, pachycephalosauria, late cretaceous, Wahweap Formation, Kaiparowits Formation, mesozoic","relatedInfo":"
View More<\/a>

Additional Resources<\/h4>
•Review of pachycephalosaurian dinosaurs from the Grand Staircase-Escalante National Monument, southern Utah, by D.K. Evans, T. Williamson, M.A. Loewen, and J.I. Kirkland, 2013<\/a>

<\/div>","classification":"Ornithischia, Marginocephalia, Pachycephalosauria","age":"
0<\/div>Late Cretaceous (100-66 Ma)","formation":"Kaiparowits Formation"},{"dinoName":"Velociraptorines<\/strong>","dinoImages":"
Utahraptor<\/em> tail from the Utahraptor<\/em> megablock, which was excavated about 6 miles due west in the Stykes quarry on Utahraptor Ridge. Only velociraptorines and microraptorines have the extremely long tendons that overlap over four to five vertebrae.\" href=\"https:\/\/geology.utah.gov\/apps\/dino-database\/images\/veloceraptorines1.jpg\">\r\n\t\t\t\t\t\"\"\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a>\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t<\/span>\r\n\t\t\t\t<\/a><\/div>","dinoDescription":"

Velociraptorines<\/h4>
Although Utahraptor<\/em> is a dromaeosaurine dromaeosaurid, the discovery of a highly stiffened tail of a small velociraptorinae indicates that both subfamilies of dromaeosaurids were present in the Yellow Cat Member of the Cedar Mountain Formation. The concurrence of both distinctive tooth types indicates that both groups were present throughout the Cre ... Read More<\/a>