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Exposures of non-marine and in places marine sandstone of the Paleocene Las Virgenes Sandstone occur in the Transverse Ranges. Stratigraphically equivalent non-marine and marine sandstones occur in the Paleocene Silverado Formation of the Peninsular Ranges (see Colburn, this volume, for location map). The Las Virgenes Sandstone is exposed in the Santa Monica Mountains, which border the northern side of the Los Angeles basin. The Silverado Formation is present in the Santa Ana Mountains and in the San Joaquin Hills, both of which border the southeastern portion of the basin. A petrographic analysis of the Las Virgenes and Silverado sandstones may yield clues concerning the origin of these two units presently exposed in distinct geomorphic provinces.

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