Abstract

Lithologic provenance modeling is a deductive technique for identifying matches between actual compositions of conglomerates and modeled conglomerate compositions from hypothetical source sections. The method is applied to the Echo Canyon Conglomerate in northeastern Utah, a Coniacian-Santonian synorogenic conglomerate generally assumed to have been derived from the Crawford thrust sheet. The Echo Canyon is problematic because it is composed of abundant quartzite clasts, most of which could have been derived from any of several source formations ranging in age from Proterozoic through Jurassic. Lithologic provenance modeling, paleocurrent data, and regional structural relations indicate that the Echo Canyon was derived from three separate stratigraphic sections exposed on the inactive Willard thrust sheet and the eastern flank of the Wasatch basement culmination.

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