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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