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Scientific Investigations Map 3240

Map Showing Principal Coal Beds and Bedrock Geology of the Ucross-Arvada Area, Central Powder River Basin, Wyoming

By Carol L. Molnia

Thumbnail of and link to report PDF (2.5 MB)Abstract

The Ucross-Arvada area is part of the Powder River Basin, a large, north-trending structural depression between the Black Hills on the east and the Bighorn Mountains on the west. Almost all of the study area is within Sheridan and Johnson Counties, Wyoming.

Most of the Ucross-Arvada area lies within the outcrop of the Wasatch Formation of Eocene age; the extreme northeast corner falls within the outcrop of the Tongue River Member of the Fort Union Formation of Paleocene age. Within the Powder River Basin, both the Wasatch Formation and the Tongue River Member of the Fort Union Formation contain significant coal resources.

The map includes locations and elevations of coal beds at 1:50,000 scale for an area that includes ten 7½-minute quadrangles covering some 500 square miles. The Wasatch Formation coal beds shown (in descending order) are Monument Peak, Walters (also called Ulm 1), Healy (also called Ulm 2), Truman, Felix, and Arvada. The Fort Union Formation coal beds shown (in descending order) are Roland (of Baker, 1929) and Smith.

First posted April 22, 2013

For additional information contact:
Director, Central Energy Resources Science Center
U.S. Geological Survey
Box 25046, MS-939
Denver Federal Center
Denver, CO 80225-0046

Part or all of this report is presented in Portable Document Format (PDF); the latest version of Adobe Reader or similar software is required to view it. Download the latest version of Adobe Reader, free of charge.

Suggested citation:

Molnia, C.L., 2013, Map showing principal coal beds and bedrock geology of the Ucross-Arvada area, central Powder River Basin, Wyoming: U.S. Geological Survey Scientific Investigations Map 3240, 11 p. pamphlet, 1 sheet, scale 1:50,000.


Geographic and Geologic Setting—Central Powder River Basin

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