POTD July 18, 2013: Wasatch-Cache National Forest, Weber County, Utah

Wasatch-Cache National Forest, Weber County, Utah
Photographer: Ken Krahulec

Prominent cliffs of gently dipping Mississippian-age Deseret (upper) and Gardison (lower) Limestone are exposed along the walls of Ogden Canyon. These strata are part of a thrust sheet emplaced during the Sevier orogeny, a regional mountain-building event that affected much of western Utah between about 140 and 50 million years ago.

POTD July 17, 2013: Crystal Geyser, Green River, Grand County, Utah

Crystal Geyser, Green River, Grand County, Utah.
Photographer: Taylor Boden

Colorful travertine (calcium carbonate) is deposited around cold-water, carbon-dioxide-driven Crystal Geyser.

POTD July 16, 2013: Dixie National Forest, Kane County, Utah

Dixie National Forest, Kane County, Utah
Photographer: Tyler Knudsen

Golden aspen, blue sky, and dark basaltic lava provide dramatic contrast along the Navajo Lake Loop Trail on the Markagunt Plateau. The geologically young Quaternaryage lava erupted from a nearby cinder cone and flowed across Duck Creek, creating a natural dam that formed Navajo Lake.

POTD July 15, 2013: Navajo Indian Reservation, San Juan County, Utah

Navajo Indian Reservation, San Juan County, Utah
Photographer: Phil Powlick

The wind has formed ripples on the surface of a dune in Monument Valley along the Utah-Arizona border.

POTD July 12, 2013: Kolob Canyons, Zion National Park, Washington County, Utah

Kolob Canyons, Zion National Park, Washington County, Utah
Photographer: Michael Vanden Berg

Jurassic-age Navajo Sandstone forms the massive red cliffs of the often-overlooked Kolob Canyons area of Zion National Park. Hanging valleys are present where relatively small tributary streams have eroded downward at a slower rate than the larger trunk stream.

POTD July 11, 2013: Rose Canyon, Salt Lake County, Utah.

Rose Canyon, Salt Lake County, Utah.
Photographer: Michael Vanden Berg

Step Mountain is aptly named for several resistant Tertiary-age andesite dikes that display exceptional horizontal columnar joints.

POTD July 10, 2013: Wasatch Range, Utah & Wasatch Counties, Utah.

Wasatch Range, Utah & Wasatch Counties, Utah
Photographer: Robert F. Biek

Framed by blooming gray rabbitbrush (Chrysothamnus nauseosus) above the east shore of Deer Creek Reservoir, Mt. Timpanogos is formed of Pennsylvanian-age, shallow- marine limestone and sandstone of the Oquirrh Formation. The small patch of snow is in Cascade Cirque, one of several glacier-carved basins on the east side of the 11,749-foot-tall mountain.

POTD July 9, 2013: East of the Green River, Grand County, Utah.

East of the Green River, Grand County, Utah.

Photographer: Don DeBlieux

A summer evening arrives with the promise of cooler temperatures at the UGS paleontology camp near the Crystal Geyser Dinosaur Quarry.

POTD July 8, 2013: Capitol Reef National Park, Garfield County, Utah

Capitol Reef National Park, Garfield County, Utah
Photographer: Paul Kuehne

The Waterpocket Fold affords a wonderful view of the geology of Grand Gulch. The Entrada Sandstone (reddish-orange rock on the right) and Navajo Sandstone (pale-orange rock on the left and middle distance) were formed in a desert  environment beginning about 185 million years ago in the Jurassic Period.

POTD July 5, 2013: Cookie Jar Butte, Glen Canyon National Recreation Area, Kane County, Utah

Cookie Jar Butte,Glen Canyon National Recreation Area, Kane County.
Photographer: Jim Davis

Cookie Jar Butte, named for the gigantic, cylindrical weathering pits that dot its peninsula, towers above Padre Bay on Lake Powell.