Abstract

The eastern border of the northern Carson Range, at Mount Rose, is important for the study of regional Sierran tectonic and faulting chronology. There Louderback indicated that more than 5000 feet of post-Miocene-Pliocene displacements occurred along the eastern front of the Carson Range at the Mount Rose cross section. He concluded that the entire Carson Range (hence the Sierra) was uplifted as a block along that frontal fault in post-late Miocene time.

The structural evidence at Mount Rose has been re-examined. It may be reinterpreted as the result of formation of a strato-volcano over a rough terrain, and its subsequent deep erosion, as contrasted with the earlier interpretation involving major fault displacement after agglomerate and flow deposition. The new structural evidence and interpretation indicates that there has been little significant faulting along the Sierra Nevada front at Mount Rose since Miocene-Pliocene volcanism.

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