Abstract

The geometry of the late Cenozoic uplift of the Sierra Nevada is determined from the record of Tertiary river channels and volcanic rocks and from gross physiography of the range. This geometry is described by means of a structure contour map. Fossil mammals, some spore-pollen data, physical stratigraphy, K-A dates, and physiography indicate that the last major uplift began during Pliocene time and that the eastern escarpment developed subsequently by downfaulting of the area to the east. The simple geometry of movements over a large area in the Sierra Nevada, contrasted with the complex pattern of movements to the east and west during the same interval, seems likely to be a direct expression of processes that have produced crustal material during the rise of the Sierra.

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