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The AAPG/Datapages Combined Publications Database
Wyoming Geological Association
Abstract
Thin-Skinned Shortening Geometries of the South Fork Fault: Bighorn Basin, Park County, Wyoming
Abstract
This paper presents a new interpretation of the South Fork Fault in light of thin-skinned thrust theory. Cross-sections and seismic data are presented which indicate that the South Fork Fault is an allochthonous salient which was emplaced in the Bighorn basin during the early to middle Eocene. All observed structural geometries can be interpreted as developing under a compressional regime, similar to the Wyoming-Utah-Idaho Thrust Belt. Faults either follow bedding-plane surfaces, cut up section in the direction of tectonic transport or form back-thrusts. A single de'collement within the Jurassic Gypsum Spring Formation appears to dominate. Tectonic transport was approximately southeast, parallel to tear faults in the allochthonous plate.
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