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Scientific Investigations Map 3053

Geologic Map of Upper Cretaceous and Tertiary Strata and Coal Stratigraphy of the Paleocene Fort Union Formation, Rawlins-Little Snake River Area, South-Central Wyoming

By R.D. Hettinger, J.G. Honey, M.S. Ellis, C.S.V. Barclay, and J.A. East


Thumbnail of and link to Sheet 1 PDF (6 MB)

This report provides a map and detailed descriptions of geologic formations for a 1,250 square mile region in the Rawlins-Little Snake River coal field in the eastern part of the Washakie and Great Divide Basins of south-central Wyoming. Mapping of geologic formations and coal beds was conducted at a scale of 1:24,000 and compiled at a scale of 1:100,000. Emphasis was placed on coal-bearing strata of the China Butte and Overland Members of the Paleocene Fort Union Formation. Surface stratigraphic sections were measured and described and well logs were examined to determine the lateral continuity of individual coal beds; the coal-bed stratigraphy is shown on correlation diagrams. A structure contour and overburden map constructed on the uppermost coal bed in the China Butte Member is also provided.

Version 1.0

Posted October 2008

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Suggested citation:

Hettinger, R.D., Honey, J.G., Ellis, M.S., Barclay, C.S.V., and East, J.A., 2008, Geologic map of Upper Cretaceous and Tertiary strata and coal stratigraphy of the Paleocene Fort Union Formation, Rawlins-Little Snake River area, south-central Wyoming: U.S. Geological Survey Scientific Investigations Map 3053, 3 sheets.

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