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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.

POTD July 4, 2013: Dollar Lake, High Uintas Wilderness, Duchesne County, Utah

Dollar Lake, High Uintas Wilderness, Duchesne County, Utah
Photographer: Mike Hylland

To the south of Dollar Lake in the Uinta Mountains, cliffs of Precambrian-age sedimentary strata rise abruptly at the head of the Henrys Fork basin. The leftmost peak lit by the morning sun is Utah’s highest mountain, Kings Peak (13,528 feet), which was named for Clarence King, first director of the U.S. Geological Survey.

POTD July 3, 2013: Devils Postpile, Dugway Proving Ground, Tooele County, Utah

Dugway Proving Ground, Tooele County, Utah.
Photographer: Don Clark

Locally known as Devils Postpile, this andesite intrusion in the southern Cedar Mountains displays well developed columnar cooling joints.

POTD July 2, 2013: White Pine rock slide, Little Cottonwood Canyon, Salt Lake County, Utah

 Southeast of Salt Lake City, Salt Lake County, Utah
Photographer: Michael Vanden Berg

The White Pine rock slide covers the floor of Little Cottonwood Canyon with boulders of granitic rock of the Tertiary-age Little Cottonwood stock. These rocks broke loose from the north side of the glacially-carved canyon several thousand years ago.

POTD July 1, 2013: North of Moab, Grand County, Utah

North of Moab, Grand County, Utah
Photographer: Carole McCalla

A 15-inch-long theropod dinosaur track at the Copper Ridge Sauropod Tracksite. This Jurassic-age site includes the first sauropod tracks reported in Utah.

POTD June 28, 2013: Fishlake National Forest, Piute County, Utah.

Fishlake National Forest, Piute County, Utah
Photographer: Tyler Knudsen

Storm clouds gather over Mount Belknap (12,137 feet) in the Tushar Mountains, Utah’s third-highest range. The smooth, rounded slopes of this summit ridge are composed of easily eroded volcanic ash and lava flows. The mountains are part of the eruptive center of the Marysvale volcanic field, an area of intense volcanic activity between 32 and 22 million years ago.

POTD June 26, 2013: San Rafael Swell, Sevier County, Utah

San Rafael Swell, Sevier County
Photographer: Robert F. Biek

Alluvial and wind-blown sediment partly conceals the Jurassic-age Entrada Sandstone in the Last Chance Desert, which occupies the axis of the Last Chance anticline. The narrow, jagged, black ridge at the center of the photo is a basaltic dike of probable late Tertiary age (3 to 5 million years old) that intrudes the Entrada Sandstone.

POTD June 21, 2013: Big Cottonwood Canyon, Wasatch Range, Salt Lake County, Utah

Big Cottonwood Canyon, Wasatch Range, Salt Lake County
Photographer: Liz Paton

On the east slope of Mt. Millicent (10,452 feet), Lake Mary occupies part of a basin carved by Ice Age glaciers. The surrounding peaks are composed of granitic rock of the Tertiary-age Alta stock.

POTD June 18, 2013: Bryce Canyon National Park, Garfield County Utah

 

 

Garfield County
Photographer: Michael Vanden Berg

Windows form within the Tertiary-age Claron Formation as wind and water erode the brightly colored sandstone and siltstone into fins and hoodoos at Bryce Canyon National Park. Thor’s Hammer, the official icon of the Utah Geological Survey, is visible in the lower-right corner.