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Geologic units in Butte county, California

Upper Cretaceous marine rocks, unit 1 (Upper Great Valley Sequence) (Late Cretaceous) at surface, covers 1 % of this area
Upper Cretaceous sandstone, shale, and conglomerate
Lithology: sandstone; mudstone; conglomerate
Mesozoic gabbroic rocks, unit 2 (undivided) (Triassic to Cretaceous) at surface, covers 1 % of this area
Gabbro and dark dioritic rocks; chiefly Mesozoic
Lithology: gabbro; diorite
Plio-Pleistocene and Pliocene loosely consolidated deposits (Miocene to Pleistocene) at surface, covers 7 % of this area
Pliocene and/or Pleistocene sandstone, shale, and gravel deposits; in part Miocene.
Lithology: sandstone; conglomerate; claystone; shale; siltstone; limestone; evaporite; coal; sedimentary breccia
Ultramafic rocks, chiefly Mesozoic, unit 2 (Western Sierra Nevada and Klamath Mountains) (Late Proterozoic(?) to Early Jurassic) at surface, covers 2 % of this area
Ultramafic rocks, mostly serpentine. Minor peridotite, gabbro, and diabase. Chiefly Mesozoic unit 2
Lithology: peridotite; serpentinite; pyroxenite
Carboniferous marine rocks, unit 5 (Northwestern Sierra Nevada) (Paleozoic or Mesozoic) at surface, covers < 0.1 % of this area
Shale, sandstone, conglomerate, limestone, dolomite, chert, hornfels, marble, quartzite; in part pyroclastic rocks
Lithology: quartzite; chert
Eocene nonmarine rocks, unit 1 (Northern and Central California) (Eocene) at surface, covers 1 % of this area
Sandstone, shale, and conglomerate.
Lithology: sandstone; mudstone; conglomerate; siltstone; coal
Mesozoic volcanic rocks, unit 2 (Western Sierra Foothills and Western Klamath Mountains) (Jurassic) at surface, covers 9 % of this area
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
Lithology: mafic volcanic rock; intermediate volcanic rock; felsic volcanic rock; chert; sandstone; conglomerate
Quaternary glacial deposits (Pleistocene) at surface, covers < 0.1 % of this area
Glacial till and moraines. Found at high elevations mostly in the Sierra Nevada and Klamath Mountains.
Lithology: glacial drift
Tertiary volcanic flow rocks, unit 19 (Lovejoy) (Tertiary (14-16 Ma)) at surface, covers 0.9 % of this area
Tertiary volcanic flow rocks; minor pyroclastic deposits.
Lithology: basalt
Tertiary nonmarine rocks, undivided (Paleocene to Pliocene) at surface, covers < 0.1 % of this area
Undivided Tertiary sandstone, shale, conglomerate, breccia, and ancient lake deposits.
Lithology: conglomerate; sandstone; sedimentary breccia; volcanic rock (aphanitic); mudstone; limestone; siltstone
Quaternary alluvium and marine deposits (Pliocene to Holocene) at surface, covers 31 % of this area
Alluvium, lake, playa, and terrace deposits; unconsolidated and semi-consolidated. Mostly nonmarine, but includes marine deposits near the coast.
Lithology: alluvium; terrace; lake or marine deposit (non-glacial)
Undivided pre-Cenozoic metavolcanic rocks, unit 2 (undivided) (Paleozoic(?) to Mesozoic(?)) at surface, covers 0.4 % of this area
Undivided pre-Cenozoic metavolcanic rocks. Includes latite, dacite, tuff, and greenstone; commonly schistose.
Lithology: intermediate volcanic rock; mafic volcanic rock; felsic volcanic rock; greenstone; amphibolite; gabbro
Mesozoic granitic rocks, unit 3 (Sierra Nevada, Death Valley area, Northern Mojave Desert and Transverse Ranges) (Permian to Tertiary; most Mesozoic) at surface, covers 14 % of this area
Mesozoic granite, quartz monzonite, granodiorite, and quartz diorite
Lithology: granodiorite; quartz monzonite; tonalite; quartz diorite; diorite; granite; monzodiorite; quartz syenite; quartz monzodiorite; gabbro; trondhjemite; alkali-granite (alaskite); pegmatite; monzonite; aplite
Tertiary volcanic flow rocks, unit 17 (Cascade Range) (Tertiary (2-24 Ma)) at surface, covers 6 % of this area
Tertiary volcanic flow rocks; minor pyroclastic deposits.
Lithology: andesite; basalt; rhyolite; dacite; volcanic breccia (agglomerate)
pre-Cenozoic metasedimentary and metavolcanic rocks undivided (Early Proterozoic to Cretaceous) at surface, covers 1 % of this area
Undivided pre-Cenozoic metasedimentary and metavolcanic rocks of great variety. Mostly slate, quartzite, hornfels, chert, phyllite, mylonite, schist, gneiss, and minor marble.
Lithology: schist; gneiss; quartzite; argillite; phyllite; metavolcanic rock; slate; hornfels; marble; chert; sandstone; mudstone; conglomerate
Tertiary pyroclastic and volcanic mudflow deposits, unit 9 (Cascade Range) (Tertiary (2-24 Ma)) at surface, covers 14 % of this area
Tertiary pyroclastic and volcanic mudflow deposits.
Lithology: andesite; rhyolite; basalt; tuff; ash-flow tuff; ignimbrite
Permian marine sedimentary rocks, unit 2 (Northwestern Sierra Nevada) (Paleozoic or Mesozoic) at surface, covers 0.4 % of this area
Shale, conglomerate, limestone and dolomite, sandstone, slate, hornfels, quartzite; minor pyroclastic rocks
Lithology: phyllite; marble; quartzite; chert; conglomerate
pre-Cenozoic granitic and metamorphic rocks undivided (Early Proterozoic to Late Cretaceous) at surface, covers 0.5 % of this area
Granitic and metamorphic rocks, mostly gneiss and other metamorphic rocks injected by granitic rocks. Mesozoic to Precambrian.
Lithology: plutonic rock (phaneritic); gneiss; metasedimentary rock; metavolcanic rock
Paleozoic marine rocks, undivided, unit 6 (Northwestern Sierra Nevada) (Permian(?) to Jurassic(?)) at surface, covers 3 % of this area
Undivided Paleozoic metasedimentary rocks. Includes slate, sandstone, shale, chert, conglomerate, limestone, dolomite, marble, phyllite, schist, hornfels, and quartzite
Lithology: argillite; phyllite; slate; chert; marble; greenstone; sandstone
Paleozoic metavolcanic rocks, unit 3 (Northwestern Sierra Nevada) (Permian to Jurassic) at surface, covers 5 % of this area
Undivided Paleozoic metavolcanic rocks. Mostly flows, breccia and tuff, including greenstone, diabase, and pillow lavas; minor interbedded sedimentary rocks
Lithology: intermediate volcanic rock; mafic volcanic rock; felsic volcanic rock; amphibolite

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