Abstract

The contact between the Lower Miocene Vaqueros Sandstone and the Oligocene San Lorenzo Formation in the Bear Creek area as mapped by Branner (1909) is shown to be in error as it was placed in a higher stratigraphic position than at the San Lorenzo type section a few miles to the west. The following fossils with type localities in the Bear Creek area, improperly placed in the San Lorenzo Formation, are assigned here to the Vaqueros Sandstone as now mapped: the pelecypod Pecten (Pecten) sanctaecruzensis; the Foraminifera Saracenaria schencki and Robulus barbati, and the gastropod Fusus sanctaecrusis. The Pecten can now be used as an index fossil to the Vaqueros Sandstone.

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