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Scientific Investigations Map 3043

Geologic Map of the Elkhorn quadrangle, Park County, Colorado

By Chester A. Ruleman and Robert G. Bohannon


Thumbnail of and link to map PDF (2.8 MB)

The Elkhorn thrust is defined by the juxtaposition of Early and Middle Proterozoic metamorphic and igneous rocks against Mesozoic and Tertiary rocks. Within the mapped area, an imbricate frontal thrust system juxtaposes Upper Cretaceous rocks against Paleocene rocks of the South Park Formation. In the southeastern section of the quadrangle, Middle Proterozoic igneous rocks are thrust over the South Park Formation. Syntectonic conglomerates (Txc) are preserved both on the hanging wall and footwall of the Elkhorn thrust. North of the map area we have identified normal faulting of probable Quaternary age.

Version 1.0

Posted September 2008

For additional information contact:
Team Chief Scientist,
USGS Earth Surface Processes
Box 25046, Mail Stop 980
Denver, CO 80225

For sale by
U.S. Geological Survey Information Services,
Box 25286, Federal Center,
Denver, CO 80225;
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Suggested citation:

Ruleman, C.A., and Bohannon, R.G., 2008, Geologic map of the Elkhorn quadrangle, Park County, Colorado: U.S. Geological Survey Scientific Investigations Map 3043, 1 sheet, scale 1:24,000.

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