Mesozoic granite, quartz monzonite, granodiorite, and quartz diorite
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.
Undivided pre-Cenozoic metasedimentary and metavolcanic rocks of great variety. Mostly slate, quartzite, hornfels, chert, phyllite, mylonite, schist, gneiss, and minor marble.
Pliocene and/or Pleistocene sandstone, shale, and gravel deposits; in part Miocene.
Gabbro and dark dioritic rocks; chiefly Mesozoic
Ultramafic rocks, mostly serpentine. Minor peridotite, gabbro, and diabase. Chiefly Mesozoic unit 2
Granitic and metamorphic rocks, mostly gneiss and other metamorphic rocks injected by granitic rocks. Mesozoic to Precambrian.
Glacial till and moraines. Found at high elevations mostly in the Sierra Nevada and Klamath Mountains.
Tertiary volcanic flow rocks; minor pyroclastic deposits.
Undivided pre-Cenozoic metavolcanic rocks. Includes latite, dacite, tuff, and greenstone; commonly schistose.
Undivided pre-Cenozoic metavolcanic rocks. Includes latite, dacite, tuff, and greenstone; commonly schistose.
Quaternary volcanic flow rocks; minor pyroclastic deposits; in part Pliocene and Miocene.
Shale, conglomerate, limestone and dolomite, sandstone, slate, hornfels, quartzite; minor pyroclastic rocks
Limestone, dolomite, and marble whose age is uncertain but probably Paleozoic or Mesozoic
Quaternary pyroclastic and volcanic mudflow deposits.
Sandstone, shale, siltstone, conglomerate and breccia; in part Pliocene and Oligocene.
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.