Abstract
Deep Spring Valley is one of the most remarkable desert basins in California. Several thousand feet of pre-Cambrian strata and 10,000 feet of Lower Cambrian strata are wonderfully exposed around portions of the valley. A granite-monzonite series, probably of late Jurassic age, intrudes the strata on a large scale. Various conflicting ideas have been expressed in regard to the origin of the valleys of the Basin Range province. Deep Spring Valley very clearly owes its origin to faulting, the whole region being in fact a mosaic of normal fault blocks. Great fault facets are remarkably exhibited. The recency of the dislocation along the main fault is proved by many miles of sharply faulted alluvial cones; the occurrence of river beds on the top of a great fault block; and a field of very fresh lava which has been dislocated 1,500 feet, vertically. In relatively late Quaternary time a deep fresh-water lake occupied the valley.
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