Alluvium, lake, playa, and terrace deposits; unconsolidated and semi-consolidated. Mostly nonmarine, but includes marine deposits near the coast.
Older alluvium, lake, playa, and terrace deposits.
Pliocene and/or Pleistocene sandstone, shale, and gravel deposits; in part Miocene.
Upper Cretaceous sandstone, shale, and conglomerate
Shale, sandstone, conglomerate, and minor limestone; in part Oligocene and Paleocene.
Lower Cretaceous sandstone, shale, and conglomerate
Tertiary volcanic flow rocks; minor pyroclastic deposits.
Sandstone, shale, and conglomerate; mostly well consolidated
Franciscan complex: Cretaceous and Jurassic sandstone with smaller amounts of shale, chert, limestone, and conglomerate. Includes Franciscan melange, except where separated--see KJfm.
Selected large landslides, such as Blackhawk slide on north side of San Gabriel Mountains; early to late Quaternary.