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Upper Cretaceous marine rocks (?)

Upper Cretaceous sandstone, shale, and conglomerate (?)
State California
Name Upper Cretaceous marine rocks (?)
Geologic age Cretaceous
Comments Small area composed primarily of conglomerate in northern part of San Francisco Bay area. Considered Cretaceous in age by Blake and others (2000)
Primary rock type conglomerate
Secondary rock type sandstone
Other rock types basalt
Lithologic constituents
Map references
Jennings, C.W., Strand, R.G., and Rogers, T.H., 1977, Geologic map of California: California Division of Mines and Geology, scale 1:750,000.
Unit references
Jennings, C.W., Strand, R.G., and Rogers, T.H., 1977, Geologic map of California: California Division of Mines and Geology, scale 1:750,000.
Jennings, C.W., 1985, An explanatory text to accompany the 1:750,000 scale fault and geologic maps of California: California Division of Mines and Geology, Bulletin 201, 197 p.
Koenig, J.B., 1963, Geologic map of California, Olaf P. Jenkins edition, Santa Rosa sheet, scale 1:250,000.
Blake, M.C., Jr., Graymer, R.W., and Jones, D.L., 2000, Geologic map and map database of parts of Marin, San Francisco, Alameda, Contra Costa, and Sonoma Counties, California: U.S. Geological Survey Miscellaneous Field Studies Map MF 2337, 29 p., scale 1:75,000.
Counties Marin