Santa Susana Quadrangle: Supplement 1 from "Geology of a portion of the Santa Susanna Mountains, Los Angeles County, California" (Thesis)

The Santa Susanna Mountains lie to the west and north of the City of San Fernando, California. The mountains form the northwest boundary of the San Fernando Valley, which is separated from Los Angeles and its suburbs by the Santa Monica Mountains. About five and one-half square miles of country were mapped, this area lying north-northeast of Santa Susanna Pass, at the northwest corner of San Fernando Valley. The valley is noted for its productive farm land. In the foothills of the Santa Susanna Mountains there are many week-end cabins, together with cattle ranches. Cattle are grazed principally on the Modelo Formation, which, because of its character, allows good grass to grow. While there has been a little oil prospecting and drilling, no oil has been found in the area mapped. There are, however, good producing fields on the north side of the Santa Susanna Mountains