| 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. |
| Genre: | USGS Numbered Series |
| ProdID: | 97772 |
| Citation Author: | Bohannon, Robert G.; Ruleman, Chester A. |
| Citation Contributing Office: | Earth Surface Processes Team |
| Citation Datum: | |
| Citation Day: | |
| Citation Edition: | Version 1.0 |
| Citation Editor: | |
| Citation End Page: | |
| Citation Issue: | |
| Citation Keywords: | |
| Citation Language: | ENGLISH |
| Citation Larger Work Title: | |
| Citation LatN: | 0390730 |
| Citation LatS: | 0390000 |
| Citation LonE: | -1053730 |
| Citation LonW: | -1054500 |
| Citation Month: | |
| Citation No Pagination: | N |
| Citation Number Of Pages: | |
| Citation Online Only Flag: | Y |
| Citation Phsyical Description: | Map: 34.5 x 33 inches; Downloads Directory |
| Citation Projection: | Polyconic |
| Citation Public Comments: | |
| Citation Publisher: | U.S. Geological Survey |
| Citation Series: | Scientific Investigations Map |
| Citation Series Code: | SIM |
| Citation Series Number: | 3082 |
| Citation Search Results Text: | Geologic Map of the Sulphur Mountain Quadrangle, Park County, Colorado; 2009; SIM; 3082; Bohannon, Robert G.; Ruleman, Chester A. |
| Citation Start Page: | |
| Citation Volume: | |
| Citation Year: | 2009 |
| Type: | citation/reference |
| Text: | Geologic Map of the Sulphur Mountain Quadrangle, Park County, Colorado; 2009; SIM; 3082; Bohannon, Robert G.; Ruleman, Chester A. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/sim_3082.jpg |
| URL (INDEX PAGE): | http://pubs.usgs.gov/sim/3082/ |
| Date Other: | Tue, 18 Aug 2009 00:00 -0500 |
| Publisher: | U.S. Geological Survey |
