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Scientific Investigations Map 3082

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## Geologic map of the Sulphur Mountain quadrangle, Park County, Colorado

#### By Robert G. Bohannon and Chester A. Ruleman

| Abstract
The main structural element in  the Sulphur Mountain quadrangle is the Elkhorn thrust. This northwest-trending  fault is the southernmost structure that bounds the west side of the Late  Cretaceous and early Tertiary Front Range basement-rock uplift. The Elkhorn  thrust and the Williams Range thrust that occurs in the Dillon area north of  the quadrangle bound the west flank of the Williams Range and the Front Range  uplift in the South Park area. Kellogg (2004) described widespread, intense  fracturing, landsliding, and deep-rooted scarps in the crystalline rocks that  comprise the upper plate of the Williams Range thrust. The latter thrust is  also demonstrably a low-angle structure upon which the fractured bedrock of the  upper plate was translated west above Cretaceous shales. Westward thrusting  along the border of the Front Range uplift is probably best developed in that  area. By contrast, the Elkhorn in the Sulphur Mountain quadrangle is poorly  exposed and occurs in an area of relatively low relief. The thrust also  apparently ends in the central part of the quadrangle, dying out into a broad  area of open, upright folds with northwest axes in the Sulphur Mountain area. | First posted August 17, 2009
-  **Map** PDF (8.0 MB) 
- **Downloads** Directory  Contains: associated database files. Refer to the Readme and Metadata files for more information. 

**For additional information contact:**          Team Chief Scientist,          USGS Earth Surface Processes          Box 25046, Mail Stop   980          Denver, CO 80225http://esp.cr.usgs.gov/

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### Suggested citation:

Bohannon, R.G., and Ruleman, C.A., 2009, Geologic map of theSulphur Mountain quadrangle, Park County, Colorado:U.S. Geological Survey Scientific Investigations Map 3082,scale 1:24,000.

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