This paper presents the more important structural and stratigraphic features of the geology of more than 1,000 square miles of sedimentary outcrops which occur in some of the most inaccessible country in California.

The area presented is structurally an east-plunging anticlinorium. It is divided into three general divisions by the Pine Mountain and Santa Ynez thrust faults. Most interesting is the complex central part which lies between these faults and constitutes the major part of the anticlinorium. Imposed upon this dominant regional feature are numerous faults and tightly folded to overturned structures which display a definite tectonic pattern.

More than 35,000 feet of sedimentary section is present, ranging in age from middle Miocene to Jurassic (Franciscan). Approximately 13,000 feet of this section has been recognized as upper Eocene. It is divided into the Coldwater, Cozy Dell, Matilija, and Juncal formations of current usage. The Sierra Blanca limestone is considered the basal unit of the Juncal. A general lithologic description of the formations and their relationships are presented, including a discussion of the several hiatuses of deposition.

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