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farther west and unconformably overlies the Escondido series. The

Upper Pliocene series crops out still farther to the west, and completes

the stratigraphic record as recognized by Hershey. He believed all of

these units to be no older than Upper Miocene.

The discovery and development of the oil fields of the Ventura

basin greatly stimulated geologic studies in this region. Kew (1924)

published the first comprehensive geologic map and report of the eastern

Ventura basin and the southwestern Soledad basin. He named and

briefly described the Mint Can yon formation, which in part is the

Mellenia series of Hershey. He rejected Hershey's term Escondido

series, and tentatively correlated those beds with the Oligocene Sespe

formation found in the Ventura basin farther west. The northern contact

of the Mint Canyon formation against the Pelona schist was mapped as a

fault contact by Kew.

Clements (1932) studied the southeastern portion of the Tejon

quadrangle which adjoins a part of the north border of the area mapped

by ,Kew. In contrast to Kew, who believed the contact between the Mint

Canyon formation and the Pelona schist to be a fault, Clements (1937)

mapped the westward continuation as a steeply dipping, depositional

contact.

A study of the Elizabeth Lake quadrangle was made by

Simpson ( 1934). The southwestern portion of this 30-minute quadrangle

includes the San Francisquito, Bouquet Reservoir, Red Rover, and