Continental shelf sediments of southern California

Sediments of the continental shelf near the cities of Santa Monica, San Pedro, and San Diego, California, were classified and charted in groups composed of authigenic, organic, residual, relict, and detrital types. Representatives of the first four groups occur only where they are not masked by the generally more rapidly deposited detrital sediments. The latter, taken alone, present a relatively simple gradation from coarse- to fine-grained in a seaward direction.