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Geologic Map of the Chico Quadrangle



Geologic map of the Chico Quadrangle, California


California Geological Survey, Regional Geologic Map No. 7A, 1:250,000 scale

Compiled by: G. J. Saucedo and D.L. Wagner

1992
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DESCRIPTION OF MAP UNITS

Artificial fill 
Dredge or mine tailings
Alluvium
Natural levee and channel deposits
Basin deposits (Alluvium)
Landslide deposits
Lake deposits
Fan deposits
Terrace deposits
Glacial deposits
Modesto Formation (Alluvium)
Riverbank Formation (Alluvium)
Pleistocene nonmarine sedimentary rocks
Red Bluff Formation
Pleistocene volcanic rocks (b-basalt, bp-scoria and tuff)
Volcanic sediments of Sutter Buttes QPI-Volcanic lake beds
Volcanic rocks of Sutter Buttes (a-andesite, r-rhyolite)
Tuffs of Oroville Pnt-Nomlaki Tuff
Tuscan Formation Pnt-Nomlaki Tuff
Laguna Formation
Pliocene nonmarine sedimentary rocks
Pliocene intrusive rocks (a-andesite, b-basalt)
Pliocene volcanic rocks (a-andesite, b-basalt)
Cinder cone or volcano; major Pelean domes at Sutter Buttes
Miocene-Pliocene channel deposits
Sutter Formation
Miocene-Pliocene intrusive rocks (a-andesite, b-basalt)
Miocene-Pliocene volcanic rocks (b-basalt, a-andesite, af-andesite flows, ap-andesite pyroclastics, t-dacitic tuff-breccia)
Lovejoy Basalt
Oligocene-Miocene volcanic rocks (r-rhyolite tuff and sediments)
Capay Formation
Ione Formation
"Auriferous" Gravels
Upper Cretaceous rocks
Chico Formation
MESOZOIC PLUTONIC ROCKS
Granite, granodiorite
Quartz diorite, tonalite, trondhjemite, quartz monzonite
Diorite
Gabbro
Granite, granodiorite
Quartz diorite, trondhjemite
Diorite
Gabbro
Ultramafic rocks
SMARTVILLE COMPLEX & CENTRAL BELT
Mariposa Formation
Logtown Ridge Formation
Monte de Oro Formation
Jurassic volcanic rocks
Volcanic rocks
Quartz diorite and tonalite
Dike complex
Gabbroic rocks
Massive diabase
Ultramafic rocks
PALEOZOIC AND MESOZOIC ROCKS
MzPz - Undifferentiated
lc - Lake Combie complex
sc - Slate Creek complex
Metasedimentary rocks
Metavolcanic rocks
Volcaniclastic sediments
Chert and chert breccia
Limestone and marble
Massive diabase
Metadiorite
Gabbro
Ultramafic rocks
FEATHER RIVER PERIDOTITE BELT
Metamorphic rocks of unknown age
mv - blueschist bearing metavolcanic rocks
Calaveras Complex
Pzcv - Metavolcanic rocks
ls - limestone
Paleozoic amphibolite
Peridotite of Melones fault zone
Pzgb - Gabbro
EASTERN BELT (Northern Sierra terrane)
Jurassic (?) metamorphic rocks
Jms - Metasedimentary rocks
Jmv - Metavolcanic rocks
Jmvs - Undivided metasedimentary and metavolcanic rocks
Sailor Canyon Formation
Jls - Limestone and marble
Triassic metasedimentary rocks
Trls - Limestone
Permian and Triassic rocks
ls - limestone
Reeve Formation
Goodhue Formation
Peale Formation
Taylor Formation
Sierra Buttes Formation
Bowman Lake Batholith
Dbt - Trondhjemite, tonalite
Dbg - Granite, granodiorite
Grizzly Formation
Shoo Fly Complex
Sandstone, siltstone, and slate
Greenstone
Chert and chert breccia
Limestone and marble
Gabbro and diabase
Serpentinized ultramafic rocks
Undifferentiated melange
Paleozoic rocks of uncertain age and correlation
MAP SYMBOLS
Contact
Fault
Thrust fault
Anticlinal fold
Synclinal fold
Monoclinal fold
Strike and dip of beds
Vertical beds
Strike and dip of overturned beds
Strike and dip of foliation
Vertical foliation
Strike and dip of dikes


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