Abstract
Field mapping and structural analysis of Paleozoic rocks in the northern Roberts Mountains in central Nevada reveal that fine-grained siliciclastic strata deposited early in the history of the Antler foreland basin underthrust and underplated as two discrete fault-bound packets to the Roberts Mountains allochthon as it encroached upon the North American continental shelf. Underplating also resulted in the intercalation of North American outer shelf/ slope strata between the two foreland basin packets as the basal detachment of the Roberts Mountains allochthon stepped downward in the sedimentary section. Deformation of foreland basin and outer shelf/slope strata was in response to ESE in-layer shortening accompanied by top ESE layer-parallel shear within 10 m of fault surfaces along which underplating and underthrusting occurred. Stratal disruption, fold tightness and asymmetry, and cleavage development near the lower and upper-bounding faults are greater than in the center of underthrust packages, indicat...
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