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Complex Deformation of Paleozoic Strata due to Folding and Faulting in the Southern Beaverhead Mountains, Clark County, Idaho

Roemer, Stefanie, William W. Little, and Robert W. Clayton
Brigham Young University-Idaho, Rexburg, ID

     The geologic map of the Scott Butte 7.5 Minute Quadrangle at the southern end of the Beaverhead Mountain Range, Idaho is a compilation of field work preformed by undergraduate students participating in the advanced field geology course at Brigham Young University–Idaho during Summer 2006, supplemented by earlier unpublished research of others. Mapping has revealed complex relationships involving Paleozoic carbonate and clastic strata that have been subjected to folding, thrust faulting, high-angle reverse faulting, and normal faulting associated with Sevier compression, Basin and Range extension, and passage of the area over the Yellowstone hotspot. Geologic relationships have been further complicated by Tertiary volcanism, both basaltic and rhyolitic, and a thick alluvial cover that blankets the valley floor. Mapping in the southern Beaverhead Mountain Range is part of an ongoing project to correlate tectonic structures across the Snake River Plain with similar features in the northern part of the Big Hole Mountains. Part of the significance of this mapping involves surface exposures of geologic features that are common to Thrust Belt hydrocarbon reservoirs and, therefore, could serve as a model for further exploration.

 

AAPG Search and Discovery Article #90071 © 2007 AAPG Rocky Mountain Meeting, Snowbird, Utah