Alluvium, lake, playa, and terrace deposits; unconsolidated and semi-consolidated. Mostly nonmarine, but includes marine deposits near the coast.
Pliocene and/or Pleistocene sandstone, shale, and gravel deposits; in part Miocene.
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.
Sandstone, shale, conglomerate, and fanglomerate; in part Pliocene and Oligocene.
Shale, sandstone, minor conglomerate, chert, slate, limestone; minor pyroclastic rocks
Older alluvium, lake, playa, and terrace deposits.
Sandstone, shale, and conglomerate.
Mesozoic granite, quartz monzonite, granodiorite, and quartz diorite