FIGURE 4.11.-Midway between Bakersfield and Santa Barbara, Calif., the San Andreas fault locally juxtaposes conglomerates of similar age but different lithologies. Porcellanite and siliceous shale clasts immediately northeast of the fault were derived chiefly from the folded and uplifted Monterey Formation in the southern Coast Ranges; plutonic, metamorphic, and sedimentary clasts across the fault to the southwest were derived from the San Emigdio Mountains of the northern Transverse Ranges. Total displacement and precise age of conglomerate units are unknown, but mapped offset of at least 16 km requires sustained Quaternary strike slip, as recognized by Hill and Dibblee (1953).