Extensive marine and nonmarine sand deposits, generally near the coast or desert playas
Alluvium, lake, playa, and terrace deposits; unconsolidated and semi-consolidated. Mostly nonmarine, but includes marine deposits near the coast.
Franciscan complex: Cretaceous and Jurassic sandstone with smaller amounts of shale, chert, limestone, and conglomerate. Includes Franciscan melange, except where separated--see KJfm.
Ultramafic rocks, mostly serpentine. Minor peridotite, gabbro, and diabase. Chiefly Mesozoic unit 3
Undivided Mesozoic volcanic and metavolcanic rocks. Andesite and rhyolite flow rocks, greenstone, volcanic breccia and other pyroclastic rocks; in part strongly metamorphosed. Includes volcanic rocks of Franciscan Complex: basaltic pillow lava, diabase, greenstone, and minor pyroclastic rocks.
Upper Cretaceous sandstone, shale, and conglomerate
Melange of fragmented and sheared Franciscan complex rocks.
Mesozoic granite, quartz monzonite, granodiorite, and quartz diorite
Sandstone, siltstone, shale, and conglomerate; in part Pleistocene and Miocene.