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PUBLIC INFORMATION SERIES 94

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ROCK-FALL HAZARDS IN UTAH
Jessica Castleton

Rock falls pose a hazard in Utah because we live, work, and recreate in close proximity to mountains and mesas. Large rock fragments and boulders accelerate rapidly when dislodged from cliffs and hillsides and can cause significant damage to homes, property, roadways, and vehicles, as well as loss of life. Recent damaging rock falls in Utah highlight the importance of recognizing this hazard. This 4-page, full color brochure provides more information on the rock fall hazard in Utah, including causes of rock falls, how to recognize the hazard, and what you can do to reduce potential rock fall damage.

4 p. (2 sided) brochure

PI-94……….free

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MAP 241

m-241-insertGEOLOGIC MAP OF THE WHITE HOUSE QUADRANGLE, GRAND COUNTY, UTAH
Hellmut H. Doelling and Paul Kuehne

The White House quadrangle is located northeast of Arches National Park in eastern Utah. Exposed strata range from Late Jurassic Brushy Basin Member of the Morrison Formation to Late Cretaceous Mancos Shale. The quadrangle overlies the ancestral Paradox basin and is influenced by salt-related folds, including the Salt Valley anticline to the west and Cisco Dome to the east.

CD (2 pl., 1:24,000)

M-241………$14.95

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MAP 240

m-240GEOLOGIC MAP OF THE SAGERS FLAT QUADRANGLES, GRAND COUNTY, UTAH
Hellmut H. Doelling and Paul Kuehne

The Sagers Flat quadrangle is located northeast of Arches National Park in eastern Utah. Exposed strata range from Early Cretaceous Cedar Mountain Formation to Late Cretaceous Mancos Shale. The area overlies the ancestral Paradox basin and is influenced by salt-related folds, including the Salt Valley anticline to the west and Cisco Dome to the east.

CD (2 pl., 1:24,000)

M-240……….$14.95

GET IT HERE

MAP 239

m-239-insertGEOLOGIC MAP OF THE THOMPSON SPRINGS QUADRANGLES, GRAND COUNTY, UTAH
Hellmut H. Doelling and Paul Kuehne

The Thompson Springs quadrangle is located north of Arches National Park in eastern Utah. Exposed strata range from Early Cretaceous Cedar Mountain Formation to Late Cretaceous Castlegate Sandstone. The quadrangle overlies the ancestral Paradox basin and is influenced by salt-related folds, including the Salt Valley anticline to the west and Cisco Dome to the east.

CD (2 pl., 1:24,000)

M-239……….$14.95

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MAP 236

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GEOLOGIC MAP OF THE CHARLESTON QUADRANGLE, WASATCH COUNTY, UTAH
Robert F. Biek and Mike Lowe

The Charleston quadrangle lies on the south edge of a structural and topographic saddle between the Wasatch Range and Uinta Mountains.  The quadrangle includes the southern part of Heber City and Heber Valley and the northern half of Round Valley, as well as parts of Deer Creek Reservoir and Wasatch Mountain State Park.  The quadrangle also straddles the north edge of the Charleston-Nebo thrust plate, and thus includes three distinct groups of rocks: (1) a nearly complete section of Pennsylvanian rocks of the Oquirrh Formation that comprises the Charleston thrust plate; (2) underlying, southeast-dipping Jurassic and Triassic strata below the Charleston thrust; and (3) Upper Proterozoic, Cambrian, and Mississippian strata that are exposed in a structurally complicated zone between the Charleston thrust and Deer Creek detachment faults.
A variety of late Tertiary and Quaternary deposits record the evolution of the present landscape.

This geologic map and report provide basic geologic information necessary to further evaluate geologic hazards and resources in the area, and to gain an understanding of the geology upon which this landscape developed.

CD (28 p., 2 pl., 1:24,000)

M-236………$14.95

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MAP 233

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GEOLOGIC MAP OF THE PROVO 7.5′ QUADRANGLE, UTAH COUNTY, UTAH
Barry J. Solomon and Michael N. Machette

The Provo 7.5′ quadrangle covers east-central Utah Valley and includes Provo, the third largest city in Utah.  Hobble Creek, the Provo River, and Spanish Fork are the primary streams in the quadrangle, flowing westward from the Wasatch Range to the Provo Bay portion of Utah Lake.  U.S. Interstate Highway 15 extends from north to south through the map area.  Included are two plates—a geologic map at 1:24,000 scale and an explanation sheet.
2 pl., scale 1:24,000, ISBN 1-55791-799-X, (supercedes OFR-525)

M-233……..$11.95

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GeoSight— Wall Arch, a Fallen Giant

geosights-wall-arch-beforeDuring the night of August 4, 2008, Utah lost a popular giant when Wall Arch, a prominent arch along the Devils Garden Trail in Arches National Park, collapsed.

While not the largest or most famous arch in the park, Wall Arch was still a favorite due to its proximity to Landscape Arch along the always-busy trail. With a measured span of 55 feet, it was ranked as 12th largest in the park (some publications and Web sites give the span as 71 feet – this is actually the “breadth”, a dimension that is not useful for comparing arches).

While no arch lasts forever, it is still extremely rare to see such a dramatic example of “geology in action.” We do not have a good geologic tool for dating arch formation, but we are sure that Wall Arch had stood nearly unchanged for hundreds, and probably thousands of years.

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OPEN-FILE REPORT 549DM

ofr-549Interim Geologic Map of the Seep Ridge 30′ x 60′ Quadrangle, Uintah, Duchesne, and Carbon Counties, Utah, and Garfield and Rio Blanco Counties, Colorado
Douglas A. Sprinkel

Web only- 3 pl., 1:100,000, contains GIS data (supercedes OFR-507)

GET IT HERE

PUBLIC INFORMATION SERIES 93

pi-93FOSSIL ENVIRONMENTS IN UTAH
Carole McCalla

Colorful images show Utah’s different environments over the past 500 million years. Selected fossils from each environment are identified and range from ocean trilobites, to fresh-water fish, to plants, to dinosaurs, and Ice Age mammals.

1 p. (2 sided) flyer
PI-93……….free

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St George 30′ x 60′ 3-D Geologic Map and Virtual Field Trip

map-overlayThrough the use of computers and the Internet, and virtual globes such as Google Earth, we now have a way around the inherent limitations of depicting the third dimension on a standard paper geologic map. To help users gain this 3-D advantage, the UGS created an overlay of the new geologic map of the St. George 30′ x 60′ quadrangle in southwest Utah. This 3-D visualization brings the map to life, dramatically showing the relationship between geology and topography. A virtual field trip for the St. George 30′ x 60′ quadrangle, which uses placemarks to highlight selected geologic features, was also created.

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