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While exploring with the Wheeler Surveys in 1871 and 1872, Grove Karl Gilbert recognized and demonstrated that faulting, rather than folding, dominated mountain building in the basin ranges. Widely accepted now, this concept was challenged by Spurr and others. Gilbert recognized further that relief had been produced incrementally along these range-bounding faults, evidenced by “piedmont scarps,” which he first noted and named. Piedmont scarps, in turn, he recognized as evidence of earthquakes, and in 1883 he warned the citizens of Utah that the absence of such scarps along one segment of the front of the Wasatch Range strongly suggested that...

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