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Mesozoic volcanic rocks, unit 2 (Western Sierra Foothills and Western Klamath Mountains)

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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 2 (Western Sierra Foothills and Western Klamath Mountains)
Geologic age Jurassic
Lithologic constituents
Major
Igneous > Volcanic > Mafic-volcanic (Flow-pillows, Volcaniclastic-volcanic breccia, Pyroclastic-tuff)Basaltic lava, pillow lava, volcanic breccia, and tuff; andesite and basaltic andesite flows and pyroclastic rocks; mostly metamorphosed but original volcanic features generally visible
Minor
Igneous > Volcanic > Felsic-volcanic (Pyroclastic, Dike or sill)Massive volcanics and pyroclastic rocks of felsic composition; includes dikes and intrusions
Incidental
Sedimentary > Clastic > Sandstone (Bed)
Sedimentary > Chemical > Chert (Bed)
Sedimentary > Clastic > Conglomerate (Bed)
Comments Western Sierra Nevada and western Klamath Mountains. Mostly basaltic to andesitic breccias, flows, and tuffs, metamorphosed but with primary volcanic features generally recognizable. Minor associated sandstone and conglomerate. Largely or entirely of marine origin. Includes some rocks interpreted as ophiolites (Smartville complex)
Stratigraphic units Copper Hill Volcanics, Gopher Ridge Volcanics, Logtown Ridge Fm., Mariposa Fm. (part), Monte de Oro Fm., Oregon City Fm., Peaslee Creek Volcanics, Penon Blanco Fm., Brower Creek Volcanic Member of Mariposa Fm., Smartville Complex
References

Jennings, C.W., Strand, R.G., Rogers, T.H., Boylan, R.T., Moar, R.R., and Switzer, R.A., 1977, Geologic Map of California: California Division of Mines and Geology, Geologic Data Map 2, 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.

Burnett, J.L., and Jennings, C.W., 1962, Geologic map of California, Olaf P. Jenkins edition, Chico sheet, scale 1:250,000.

Strand, R.G., 1967, Geologic map of California, Olaf P. Jenkins edition, Mariposa sheet, scale 1:250,000.

Strand, R.G., and Koenig, J.B., 1966, Geologic map of California, Olaf P. Jenkins edition, Sacramento sheet, scale 1:250,000.

Rogers, T.H., 1966, Geologic map of California, Olaf P. Jenkins edition, San Jose sheet, scale 1:250,000.

Strand, R.G., 1964, Geologic map of California, Olaf P. Jenkins edition, Weed sheet, scale 1:250,000.

Saucedo, G.J., and Wagner, D.L., 1992, Geologic map of the Chico quadrangle, California: California Division of Mines and Geology, Regional Geologic Map Series, Map 7A, scale 1:250,000.

Wagner, D.L., Jennings, C.W., Bedrossian, T.L., and Bortugno, E.J., 1981, Geologic map of the Sacramento quadrangle, California: California Division of Mines and Geology, Regional Geologic Map Series, Map 1A, 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 Saucedo, G.J., 1987, Geologic map of the Weed quadrangle, California: California Division of Mines and Geology, Regional Geologic Map Series, Map 4A, scale 1:250,000.

Bateman, P.C., 1992, Pre-Tertiary geologic map of the Mariposa 1ø by 2ø quadrangle, Sierra Nevada, California: U.S. Geological Survey Miscellaneous Investigations Series Map I-1960, scale 1:250,000.

https://pubs.er.usgs.gov/publication/i1960

Irwin, W.P., 1994, Geologic map of the Klamath Mountains, California and Oregon: U.S. Geological Survey Miscellaneous Investigations Series Map I-2148, scale 1:500,000.

https://pubs.er.usgs.gov/publication/i2148

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.

https://pubs.er.usgs.gov/publication/mf1874C

Schweickert, R.A., 1981, Tectonic evolution of the Sierra Nevada Range, in Ernst, W.G., ed., The geotectonic development of California (Rubey Volume 1): Englewood Cliffs, N.J., Prentice-Hall, p. 87-131.

Saleeby, J.B., 1981, Ocean floor accretion and volcanoplutonic arc evolution of the Mesozoic Sierra Nevada, in Ernst, W.G., ed., The geotectonic development of California (Rubey Volume 1): Englewood Cliffs, N.J., Prentice-Hall, p. 132-181.

Day, H.W., Schiffman, Peter, and Moores, E.M., 1988, Metamorphism and tectonics of the northern Sierra Nevada, in Ernst, W.G., ed., Metamorphism and crustal evolution of the western United States (Rubey Volume 7): Englewood Cliffs, N.J., Prentice-Hall, p. 737-763.

Schweickert, R.A., Merguerian, Charles, and Bogen, N.L., 1988, Deformational and metamorphic history of Paleozoic and Mesozoic basement terranes in the western Sierra Nevada metamorphic belt, in Ernst, W.G., ed., Metamorphism and crustal evolution of the western United States (Rubey Volume 7): Englewood Cliffs, N.J., Prentice-Hall, p. 789-822.

Sharp, W.D., 1988, Pre-Cretaceous crustal evolution in the Sierra Nevada region, 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. 823-864.

Xenophontos, Costas, and Bond, G.C., 1978, Petrology, sedimentation, and paleogeography of the Smartville terrane (Jurassic) - bearing on the genesis of the Smartville Ophiolite, in Howell, D.G., and McDougall, K.A., eds., Mesozoic paleogeography of the western United States: Society of Economic Paleontologists and Mineralogists, Pacific Section, Pacific Coast Paleogeography Symposium 2, p. 291-302.

Schweickert, R.A., 1978, Triassic and Jurassic paleogeography of the Sierra Nevada and adjacent regions, California and western Nevada, in Howell, D.G., and McDougall, K.A., eds., Mesozoic paleogeography of the western United States: Society of Economic Paleontologists and Mineralogists, Pacific Section, Pacific Coast Paleogeography Symposium 2, p. 361-384.

Saleeby, J.B., and Busby, Cathy, 1993, Paleogeographic and tectonic setting of axial and western metamorphic framework rocks of the southern Sierra Nevada, California, in Dunne, G.C., and McDougall, K.A., eds., Mesozoic paleogeography of the western United States-II: Society of Economic Paleontologists and Mineralogists, Pacific Section, Book 71, p. 197-226.

Saleeby, J.B., and others, 1986, C-2 central California offshore to Colorado Plateau: Geological Society of America, Centennial Continent/Ocean Transect 10, 63 p., scale 1:500,000.
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