Tertiary volcanic flow rocks; minor pyroclastic deposits.
Quaternary volcanic flow rocks; minor pyroclastic deposits; in part Pliocene and Miocene.
Alluvium, lake, playa, and terrace deposits; unconsolidated and semi-consolidated. Mostly nonmarine, but includes marine deposits near the coast.
Tertiary pyroclastic and volcanic mudflow deposits.
Pliocene and/or Pleistocene sandstone, shale, and gravel deposits; in part Miocene.
Mesozoic granite, quartz monzonite, granodiorite, and quartz diorite
Extensive marine and nonmarine sand deposits, generally near the coast or desert playas
Recent (Holocene) volcanic flow rocks; minor pyroclastic deposits; in part Pleistocene.
Undivided pre-Cenozoic metavolcanic rocks. Includes latite, dacite, tuff, and greenstone; commonly schistose.
Sandstone, shale, and conglomerate.
Tertiary intrusive rocks; mostly shallow (hypabyssal) plugs and dikes. Includes some Mesozoic rocks.
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
Glacial till and moraines. Found at high elevations mostly in the Sierra Nevada and Klamath Mountains.
Shale, sandstone, minor conglomerate, chert, slate, limestone; minor pyroclastic rocks
Undivided Tertiary sandstone, shale, conglomerate, breccia, and ancient lake deposits.
PLAYA, MARSH, AND ALLUVIAL-FLAT DEPOSITS, LOCALLY ERODED
ASH-FLOW TUFFS AND TUFFACEOUS SEDIMENTARY ROCKS
GRANITIC ROCKS-Mostly quartz monzonite and granodiorite