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POTD December 30, 2013: La Sal Mountains, Grand and San Juan Counties, Utah

La Sal Mountains, Grand and San Juan Counties, Utah
Photographer: Jay Hill

The La Sal Mountains, near Moab in southeastern Utah, are laccoliths formed when upwelling magma intruded into and bulged the overlying sedimentary rock layers upward. The magma did not reach the surface, but subsequent erosion of the softer sedimentary rocks exposed the peak-forming igneous rocks that rise above the surrounding landscape.

POTD December 20, 2013: Abajo Mountains, San Juan County, Utah

Abajo Mountains, San Juan County, Utah
Photographer: Grant Willis

Blocky sandstone ledge deposited in an oasis-like setting between ancient sand dunes forms a resistant cap over beds of the Jurassic-age Navajo Sandstone. Chippean Rocks west of the Abajo Mountains, San Juan County.

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POTD December 19, 2013: White Canyon, Natural Bridges National Monument, San Juan County, Utah

White Canyon, Natural Bridges National Monument, San Juan County, Utah
Photographer: Michael Vanden Berg

The Owachomo Bridge was created by stream erosion of the Permian-age Cedar Mesa Sandstone. Owachomo, a Hopi term meaning “rock mound,” is named for the large rock mass found on the northeastern abutment of the bridge.

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POTD December 16, 2013: Canyonlands National Park, San Juan County, Utah

Canyonlands National Park, San Juan County, Utah
Photographer: Sonja Heuscher

Pothole reflection of Jurassic-age Wingate Sandstone cliffs in the Permian-age White Rim Sandstone. Canyonlands National Park, San Juan County

 

POTD November 12, 2013: Sipapu Bridge, Natural Bridges National Monument, San Juan County, Utah.

Sipapu Bridge, Natural Bridges National Monument, San Juan County, Utah.
Photographer: Tyler Knudsen

POTD November 11, 2013: Rainbow Bridge National Monument, San Juan County, Utah

Rainbow Bridge National Monument, San Juan County, Utah
Photographer: Mike Hylland

Rainbow Bridge near Lake Powell, Rainbow Bridge National Monument, San Juan County, Utah.

POTD October 21, 2013: Canyonlands National Park, San Juan County, Utah

Canyonlands National Park, San Juan County, Utah
Photographer: Chris DuRoss

“Zeus,” a 250-foot sandstone pinnacle, Canyonlands
National Park, San Juan County, Utah.

POTD October 16, 2013: Paradox Basin, San Juan County, Utah

Paradox Basin, San Juan County, Utah
Photographer: Michael Vanden Berg

Crude-oil pump jack, Paradox Basin, San Juan County, Utah.

POTD October 4, 2013: Lost Canyon, Needles District, Canyonlands National Park, San Juan County, Utah.

Lost Canyon, Needles District, Canyonlands
National Park, San Juan County, Utah.
Photographer: Robert Blackett

Backpackers traverse a “slick rock” rim of the Permianage Cedar Mesa Sandstone.

POTD September 27, 2013: Mesa Arch, Island in the Sky District, Canyonlands National Park, San Juan County, Utah

The La Sal Mountains viewed through Mesa Arch in the Island in the Sky District of Canyonlands National Park, San Juan County, Utah
Photographer: Taylor Boden