Alluvium, lake, playa, and terrace deposits; unconsolidated and semi-consolidated. Mostly nonmarine, but includes marine deposits near the coast.
Mesozoic granite, quartz monzonite, granodiorite, and quartz diorite
Older alluvium, lake, playa, and terrace deposits.
Sandstone, shale, siltstone, conglomerate and breccia; in part Pliocene and Oligocene.
Pliocene and/or Pleistocene sandstone, shale, and gravel deposits; in part Miocene.
Conglomerate, shale, sandstone, limestone, dolomite, marble, gneiss, hornfels, and quartzite; may be Paleozoic in part
Paleozoic and Permo-Triassic granitic rocks in the San Gabriel and Klamath Mountains
Schists of various types; mostly Paleozoic or Mesozoic age; some Precambrian.
Tertiary volcanic flow rocks; minor pyroclastic deposits.
Precambrian granite, syenite, anorthosite, and gabbroic rocks in the San Gabriel Mountains; also various Precambrian plutonic rocks elsewhere in southeastern California
Complex of Precambrian igneous and metamorphic rocks. Mostly gneiss and schist intruded by igneous rocks; may be Mesozoic in part.
Sandstone, siltstone, shale, and conglomerate; in part Pleistocene and Miocene.
Sandstone, shale, conglomerate, and fanglomerate; in part Pliocene and Oligocene.
Sandstone, shale, and conglomerate; mostly well consolidated
Sandstone, shale, and conglomerate; in part Miocene and Eocene.
Franciscan complex: Cretaceous and Jurassic sandstone with smaller amounts of shale, chert, limestone, and conglomerate. Includes Franciscan melange, except where separated--see KJfm.
Upper Cretaceous sandstone, shale, and conglomerate
Tertiary volcanic flow rocks; minor pyroclastic deposits.
Shale, sandstone, minor conglomerate, chert, slate, limestone; minor pyroclastic rocks
Cenozoic (Tertiary) granitic rocks--quartz monzonite, quartz latite, and minor monzonite, granodiorite, and granite; found in the Kingston, Panamint, Amargosa, and Greenwater Ranges in southeastern California.
Undivided pre-Cenozoic metasedimentary and metavolcanic rocks of great variety. Mostly slate, quartzite, hornfels, chert, phyllite, mylonite, schist, gneiss, and minor marble.
Granitic and metamorphic rocks, mostly gneiss and other metamorphic rocks injected by granitic rocks. Mesozoic to Precambrian.
Tertiary volcanic flow rocks; minor pyroclastic deposits.
Shale, sandstone, conglomerate, and minor limestone; in part Oligocene and Paleocene.
Tertiary intrusive rocks; mostly shallow (hypabyssal) plugs and dikes. Includes some Mesozoic rocks.
Undivided Tertiary sandstone, shale, conglomerate, breccia, and ancient lake deposits.
Sandstone, shale, and conglomerate; in part Miocene and Eocene.
Undated granitic rocks, unit 3 (Southern California)
Extensive marine and nonmarine sand deposits, generally near the coast or desert playas
Gabbro and dark dioritic rocks; chiefly Mesozoic
Precambrian granite, syenite, anorthosite, and gabbroic rocks in the San Gabriel Mountains; also various Precambrian plutonic rocks elsewhere in southeastern California
Ultramafic rocks, mostly serpentine. Minor peridotite, gabbro, and diabase. Chiefly Mesozoic unit 3
Selected large landslides, such as Blackhawk slide on north side of San Gabriel Mountains; early to late Quaternary.
Miocene marine rocks and Franciscan schist
Undivided Cretaceous sandstone, shale, and conglomerate; minor nonmarine rocks in Peninsular Ranges
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.
Tertiary pyroclastic and volcanic mudflow deposits.
Limestone, dolomite, and marble whose age is uncertain but probably Paleozoic or Mesozoic