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Late-winter ice still clings to the Colorado River near Big Bend, north of Moab. Boulders of Jurassic-age Wingate Sandstone and Triassic-age Chinle Formation line the banks of the river, eroded from the cliffs and ledges cut by the river as it has incised its channel over millions of years. Colorado River, Grand County, Utah Photographer: Adam Hiscock; © 2014

POTD January 6, 2015: Colorado River, Grand County, Utah

POTD 1-6-15 Colorado River, Grand County, Utah

Colorado River, Grand County, Utah
Photographer: Adam Hiscock; © 2014

Late-winter ice still clings to the Colorado River near Big Bend, north of Moab. Boulders of Jurassic-age Wingate Sandstone and Triassic-age Chinle Formation line the banks of the river, eroded from the cliffs and ledges cut by the river as it has incised its channel over millions of years.

POTD July 22, 2014: Arches National Park, Grand County, Utah

Arches National Park, Grand County, Utah
Photographer: Don DeBlieux; © 2013

Dissolution of subsurface salt caused the collapse of the Salt Valley anticline, forming vertical fractures in the Jurassic-age Entrada Sandstone. Weathering along the fractures has produced the spectacular fins, towers, and arches in the Devils Garden section of Arches National Park.

POTD May 20, 2014: Long Canyon viewed from Pucker Pass, Grand County, Utah

Long Canyon viewed from Pucker Pass, Grand County, Utah
Photographer: Gregg Beukelman; © 2013

At Long Canyon, stream erosion has carved a deep gorge into the east limb of the Cane Creek anticline. The canyon exposes dark-brown Triassic-age shale and sandstone of the Moenkopi and Chinle Formations capped by vertical cliffs of Triassic and Jurassic-age sandstone of the Wingate and Kayenta Formations.

POTD May 12, 2014: Courthouse Rock near Moab, Grand County, Utah

Another weekend gone by, and a photo to greet you on your Monday morning. Who went somewhere fun this weekend?

Courthouse Rock near Moab, Grand County, Utah
Photographer: Jay Hill; © 2012

POTD April 23, 2014: The Windows Section, Arches National Park, Grand County, Utah

The Windows Section, Arches National Park, Grand County, Utah
Photographer: Adam McKean; © 2012

The Windows Section, Arches National Park, Grand County.

POTD April 16, 2014: Moab, Grand County, Utah

Moab, Grand County, Utah
Photographer: Corey Unger
; © 2012

Wingate Sandstone cliffs at Kane Springs Canyon near Moab, Grand County.

Geologic Maps of the Klondike Bluffs, Mollie Hogans, and the Windows Section 7.5' Quadrangles, Grand County, Utah

By: Hellmut H. Doelling and Paul A. Kuehne

The Klondike Bluffs 7.5′ quadrangle covers a large part of Arches National Park and encompasses colorful bedrock strata ranging in age from Pennsylvania Paradox Formation to Cretaceous Mancos Shale. Salt diapirs are common throughout the area, and the Salt-Cache Valley Salt Structure is the most prominent structure, with several additional salt structures present, including the Salt Wash and Courthouse synclines and the Elephant Butte folds. Scenic resources in the area showcase joints, fins, grabens above salt wells, and the highest concentration of arches in the world.

This CD contains geographic information system (GIS) files in ESRI file geodatabase and shapefile formats. A geologic map at 1:24,000 scale and a 31-page booklet are also included in PDF format. The latest version of Adobe Reader is required to view the PDF files.

GET IT HERE

By: Hellmut H. Doelling and Paul A. Kuehne

The Mollie Hogans 7.5′ quadrangle covers a large part of Arches National Park and encompasses colorful bedrock strata ranging in age from Pennsylvanian Paradox Formation to Cretaceous Mancos Shale. Salt diapirs are common throughout the area, and the Salt-Cache Valley Salt Structure is the most prominent structure, with several additional salt structures present, including the Salt Wash and Courthouse synclines and the Elephant Butte folds. Scenic resources in the area showcase joints, fins, grabens above salt walls, and the highest concentration of arches in the world.

This CD contains geographic information system (GIS) files in ESRI file geodatabase and shapefile formats. A geologic map at 1:24,000 scale and a 31-page booklet are also included in PDF format. The latest version of Adobe Reader is required to view the PDF files.

GET IT HERE

By: Hellmut H. Doelling and Paul A. Kuehne

The Windows Section 7.5′ quadrangle covers a large part of Arches National Park and encompasses colorful bedrock strata ranging in age from Pennsylvanian Paradox Formation to Cretaceous Mancos Shale. Salt diapirs are common throughout the area, and the Salt-Cache Valley Salt Structure is the most prominent structure, with several additional salt structures present, including the Salt Wash and Courthouse synclines and the Elephant Butte folds. A one-mile-wide zone of faults is located in the Windows Section northeast of the Moab fault. Scenic resources in the area showcase joints, fins, grabens above salt walls, and the highest concentration of arches in the world.

This CD contains geographic information system (GIS) files in ESRI file geodatabase and shapefile formats. A geologic map at 1:24,000 scale and a 31-page booklet are also included in PDF format. The latest version of Adobe Reader is required to view the PDF files.

GET IT HERE

POTD March 3, 2014: The King Fisher Tower, Grand County, Utah

The King Fisher Tower, Grand County, Utah
Photographer: Stefan Kirby; ©2011

The King Fisher Tower, north of Castle Valley in Grand County, consists of arkosic sandstone and mudstone of the Permian Cutler Formation.

POTD February 25, 2014: La Sal Mountains, Grand and San Juan Counties, Utah

La Sal Mountains, Grand and San Juan Counties, Utah
Photographer: Mark Milligan; ©2011

Mount Tukuhnikivatz, a prominent peak in the La Sal Mountains, is an erosional remnant of magma that rose from depth (but never reached the surface) about 28 million years ago, forcing through and pushing up the area’s layered sedimentary rocks. View from the U.S. Forest Service Warner Lake guard station.

POTD January 10, 2014: Jurassic-age Navajo Sandstone, Grand County, Utah

Jurassic-age Navajo Sandstone, Grand County, Utah
Photographer: Kent Brown

Arches in the making (alcoves) in massive cliffs of Jurassic-age Navajo Sandstone, near Moab, Grand County.