Skip to main content

Mesozoic volcanic rocks, unit 1 (Coast Ranges)

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
State California
Name Mesozoic volcanic rocks, unit 1 (Coast Ranges)
Geologic age Jurassic to Cretaceous
Comments Coast Ranges. Jurassic to Cretaceous volcanic rocks of Franciscan Complex: basaltic pillow lava, diabase, greenstone, and minor pyroclastic rocks. Includes blueschist-grade metabasalt schist. Also includes small areas of volcanic rocks associated with Coast Range ophiolite
Primary rock type greenstone
Secondary rock type basalt
Other rock types diabase; blueschist; chert; felsic volcanic rock
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.
Jennings, C.W., 1962, Geologic map of California, Olaf P. Jenkins edition, Long Beach sheet, scale 1:250,000.
Jennings, C.W., and Strand, R.G., 1969, Geologic map of California, Olaf P. Jenkins edition, Los Angeles sheet, scale 1:250,000.
Strand, R.G., 1962, Geologic map of California, Olaf P. Jenkins edition, Redding sheet, scale 1:250,000.
Jennings, C.W., and Burnett, J.L., 1961, Geologic map of California, Olaf P. Jenkins edition, San Francisco sheet, scale 1:250,000.
Rogers, T.H., 1966, Geologic map of California, Olaf P. Jenkins edition, San Jose sheet, scale 1:250,000.
Jennings, C.W., 1959, Geologic map of California, Olaf P. Jenkins edition, San Luis Obispo sheet, scale 1:250,000.
Jennings, C.W., and Strand, R.G., 1959, Geologic map of California, Olaf P. Jenkins edition, Santa Cruz sheet, scale 1:250,000.
Jennings, C.W., 1959, Geologic map of California, Olaf P. Jenkins edition, Santa Maria sheet, scale 1:250,000.
Koenig, J.B., 1963, Geologic map of California, Olaf P. Jenkins edition, Santa Rosa sheet, scale 1:250,000.
Jennings, C.W., and Strand, R.G., 1960, Geologic map of California, Olaf P. Jenkins edition, Ukiah sheet, scale 1:250,000.
Strand, R.G., 1964, Geologic map of California, Olaf P. Jenkins edition, Weed sheet, scale 1:250,000.
Wagner, D.L., Bortugno, E.J., and McJunkin, R.D., 1990, Geologic map of the San Francisco-San Jose quadrangle, California: California Division of Mines and Geology, Regional Geologic Map Series, Map 5A, scale 1:250,000.
Wagner, D.L., and Bortugno, E.J., 1982, Geologic map of the Santa Rosa quadrangle, California: California Division of Mines and Geology, Regional Geologic Map Series, Map 2A, scale 1:250,000.
Blake, M.C., Jr., Helley, E.J., Jayko, A.S., Jones, D.L., and Ohlin, H.N., 1992, Geologic map of the Willows 1:100,000 quadrangle, California: U.S. Geological Survey Open-File Report 92-271, 42 p., scale 1:100,000.
Blake, M.C., Jr., Graymer, R.W., and Stamski, R.E., 2002, Geologic map and map database of western Sonoma, northernmost Marin, and southernmost Mendocino Counties, California: U.S. Geological Survey Miscellaneous Field Studies Map MF-2402, 43 p., scale 1:100,000.
Jayko, A.S., Blake, M.C., Jr., McLaughlin, R.J., Ohlin, H.N., Ellen, S.D., and Kelsey, Harvey, 1989, Reconnaissance geologic map of the Covelo 30- by 60-minute quadrangle, northern California: U.S. Geological Survey Miscellaneous Field Studies Map MF-2001, scale 1:100,000.
Brabb, E.E., Graymer, R.W., and Jones, D.L., 2000, Geologic map and map database of the Palo Alto 30' x 60' quadrangle, California: U.S. Geological Survey Miscellaneous Field Studies Map MF-2332, 30 p., scale 1:100,000.
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.
McLaughlin, R.J., Ellen, S.D., Blake, M.C., Jr., Jayko, A.S., Irwin, W.P., Aalto, K.R., Carver, G.A., and Clarke, S.H., Jr., 2000, Geology of the Cape Mendocino, Eureka, Garberville, and southwestern part of the Hayfork 30 x 60 minute quadrangles and adjacent offshore area, northern California: U.S. Geological Survey Miscellaneous Field Studies Map MF-2336, 30 p., scale 1:100,000.
Silberling, N.J., Jones, D.L., Blake, M.C., Jr., and Howell, D.G., 1987, Lithotectonic terrane map of the western conterminous United States: U.S. Geological Survey Miscellaneous Field Studies Map MF-1874-C, scale 1:2,500,000.
Graymer, R.W., 2000, Geologic map and map database of the Oakland metropolitan area, Alameda, Contra Costa, and San Francisco Counties, California: U.S. Geological Survey Miscellaneous Field Studies Map MF-2342, 29 p., scale 1:50,000.
Cotton, W.R., 1972, Preliminary geologic map of the Franciscan rocks in the central part of the Diablo Range, Santa Clara and Alameda Counties, California: U.S. Geological Survey Miscellaneous Field Studies Map MF-343, scale 1:62,500.
Blake, M.C., Jr., and Jones, D.L., 1981, The Franciscan Assemblage and related rocks in northern California: a reinterpretation, in Ernst, W.G., ed., The geotectonic development of California (Rubey Volume 1): Englewood Cliffs, N.J., Prentice-Hall, p. 307-328.
Blake, M.C., Jr., Jayko, A.S., McLaughlin, R.J., and Underwood, M.B., 1988, Metamorphic and tectonic evolution of the Franciscan Complex, northern California, in Ernst, W.G., ed., Metamorphism and crustal evolution of the western United States (Rubey Volume 7): Englewood Cliffs, N.J., Prentice-Hall, p. 1035-1060.
Counties Alameda - Colusa - Contra Costa - Fresno - Glenn - Humboldt - Lake - Los Angeles - Marin - Mendocino - Merced - Monterey - Napa - San Benito - San Francisco - San Luis Obispo - San Mateo - Santa Barbara - Santa Clara - Sonoma - Stanislaus - Tehama - Trinity