Abstract

West of the Sur-Nacimiento fault zone in the Southern Coast Ranges of California, strata of the Great Valley sequence are exposed in thrust plates resting tectonically on the underlying Franciscan assemblage as is the case east of the San Andreas fault. Detrital modes of sandstones from different horizons in the local sequence show the same systematic variations with Stratigraphic position as do correlative late Mesozoic strata in the main outcrop belt along the west side of the Great Valley. The similar tectonic setting and sandstone petrology suggest the rocks in the two areas are parts of a single extensive terrane separated by fault offset in the Cenozoic.

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