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Geologic Map of the Sacramento Quadrangle



Geologic Map of the Sacramento Quadrangle


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

Compilation by: D. L. Wagner, C.W. Jennings, T.L. Bedrossian, and E.J. Bortugno

1981

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DESCRIPTION OF MAP UNITS

Alluvium
Mine and dredge tailings
Levee and channel deposits
Basin deposits
Intertidal deposits
Dune sand
Lake deposits
Older alluvium
Glacial deposits
Modesto Formation
Upper and lower members
Riverbank Formation
Modesto-Riverbank Formations
Montezuma Formation
Turlock Lake Formation
Red Bluff Formation
North Merced Gravel
Basalt
Tehama Formation
Laguna Formation
San Pablo Group
Mehrten Formation
Valley Springs Formation
Markley Sandstone
Nortonville Shale
Domengine Sandstone
Capay Formation
"Auriferous" Gravels
Ione Formation
Martinez Formation
Lawlor Tuff
Dacite, rhyodacite domes
Eureka Valley Tuff
Table Mountain Latite
Putnam Peak Basalt
Guinda Formation
Chico Formation
Salt Springs Slate
Mariposa Formation
Sailor Canyon Formation
Copper Hill Volcanics
Brower Creek Volcanics
Gopher Ridge Volcanics
Logtown Ridge Formation
Jurassic metavolcanic rocks
Metasedimentary rocks
* Horizontal line pattern denotes melange terrane
Crystalline limestone and dolomite
* Horizontal line pattern denotes melange terrane
Calaveras Complex
Paleozoic-Mesozoic metamorphic rocks
Augen gneiss of uncertain age
Undifferentiated Paleozoic (?) rocks
Metavolcanic rocks
* Horizontal line pattern denotes melange terrane
Calaveras Complex volcanic rocks
PLUTONIC ROCKS
Mesozoic granitic rocks
Mesozoic dioritic rocks
Gabbroic rocks
* Horizontal line pattern denotes melange terrane
Ultramafic rocks
* Horizontal line pattern denotes melange terrane
MAP SYMBOLS
Contact
Fault
Anticlinal fold
Synclinal fold
Overturned fold
Strike and dip of beds
Strike and dip of foliation
Joints


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