Tertiary pyroclastic and volcanic mudflow deposits.
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, and conglomerate.
Shale, sandstone, minor conglomerate, chert, slate, limestone; minor pyroclastic rocks
Sandstone, shale, conglomerate, and fanglomerate; in part Pliocene and Oligocene.
Undivided Paleozoic metasedimentary rocks. Includes slate, sandstone, shale, chert, conglomerate, limestone, dolomite, marble, phyllite, schist, hornfels, and quartzite
Granitic and metamorphic rocks, mostly gneiss and other metamorphic rocks injected by granitic rocks. Mesozoic to Precambrian.
Ultramafic rocks, mostly serpentine. Minor peridotite, gabbro, and diabase. Chiefly Mesozoic unit 2
Mesozoic granite, quartz monzonite, granodiorite, and quartz diorite
Glacial till and moraines. Found at high elevations mostly in the Sierra Nevada and Klamath Mountains.
Pliocene and/or Pleistocene sandstone, shale, and gravel deposits; in part Miocene.
Undivided Paleozoic metavolcanic rocks. Mostly flows, breccia and tuff, including greenstone, diabase, and pillow lavas; minor interbedded sedimentary rocks
Gabbro and dark dioritic rocks; chiefly Mesozoic