Abstract
Surface geologic mapping, regional and high-density reflection seismic data and information from approximately 370 wells are combined to describe geometrically that area of the western Overthrust belt between the Snake River Plain and the Uinta uplift. Particular care has been taken to two-dimensionally verify interpretations of multiple thrust sheets by linear restoration. By establishing equivalence of pre-thrust lengths of affected beds, one can gain confidence in interpreted structural geometrics as well as generate data in regard to internal shortening and deformation intensity. Due to irresolvable geometric problems within sections, 47 cross sections were developed at roughly 6-mi (10 km) spacing to help verify changes in displacement or placement of key structural lements. Displacements of 0 to 32 mi (51 km) have been demonstrated, and both structure of faults and subcrop relations of Absaroka and younger thrusts are described. Jurassic to Paleocene (Sevier) thrusts were active across a previously deformed cratonic shelf terrane and interacted with active structural elements such as the Uinta uplift, Gros Ventre Range, and Moxa arch. Thrusts are progressively younger to the east, except for the Darby-Prospect pair in which the Darby system is younger. End_of_Article - Last_Page 1334------------
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