Undivided Paleozoic metasedimentary rocks. Includes slate, sandstone, shale, chert, conglomerate, limestone, dolomite, marble, phyllite, schist, hornfels, and quartzite
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.
Mesozoic granite, quartz monzonite, granodiorite, and quartz diorite
Tertiary pyroclastic and volcanic mudflow deposits.
Shale, sandstone, minor conglomerate, chert, slate, limestone; minor pyroclastic rocks
Sandstone, shale, conglomerate, and fanglomerate; in part Pliocene and Oligocene.
Undivided pre-Cenozoic metavolcanic rocks. Includes latite, dacite, tuff, and greenstone; commonly schistose.
Ultramafic rocks, mostly serpentine. Minor peridotite, gabbro, and diabase. Chiefly Mesozoic unit 2
Undivided Paleozoic metavolcanic rocks. Mostly flows, breccia and tuff, including greenstone, diabase, and pillow lavas; minor interbedded sedimentary rocks
Undivided pre-Cenozoic metasedimentary and metavolcanic rocks of great variety. Mostly slate, quartzite, hornfels, chert, phyllite, mylonite, schist, gneiss, and minor marble.
Limestone, dolomite, and marble whose age is uncertain but probably Paleozoic or Mesozoic
Tertiary volcanic flow rocks; minor pyroclastic deposits.
Sandstone, shale, and conglomerate.
Gabbro and dark dioritic rocks; chiefly Mesozoic
Upper Cretaceous sandstone, shale, and conglomerate
Undivided Tertiary sandstone, shale, conglomerate, breccia, and ancient lake deposits.
Pliocene and/or Pleistocene sandstone, shale, and gravel deposits; in part Miocene.