Abstract

A reconstruction of the structure in west-central Utah shows that a major foredeep with sedimentary deposits possibly as thick as 6 km (now eroded) probably existed at the present site of the Sevier Desert during Early Cretaceous time and conceivably during Late Jurassic time. Concurrent emplacement and erosion of the Canyon Range thrust sheet provided the load and sediment, much like the Willard-Paris thrust sheet did for the better documented Early Cretaceous foredeep in northern Utah and eastern Idaho. The onset of major thrusting in western Utah may have been as early as Callovian or as late as Albian, a 50 m.y. time span.

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