The Miocene paleogeography, age of faulting, and present structure of the lower (northern) Salinas Valley, lying between Sierra de Salinas (northern Santa Lucia Range) on the west and the Gabilan Range on the east, have been variously interpreted by many geologists. In recent years Clark has made several contributions.1 In his most recent discussion appears the following statement which apparently was the basis for revising his former interpretation of the Miocene paleogeography of the lower Salinas Valley.

It is feared that there has been a misinterpretation of the character of the volcanic detritus in the Miocene sediments, particularly with...

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