Schist of various types and ages, unit 2 (Southern and West-central California)

Schists of various types; mostly Paleozoic or Mesozoic age; some Precambrian.
State California
Name Schist of various types and ages, unit 2 (Southern and West-central California)
Geologic age Late Cretaceous to Eocene
Lithologic constituents
Major
Metamorphic > Schist > Mica-schist (Greenschist, Amphibolite)Ranges from quartz-muscovite to quartz-biotite schist
Incidental
Metamorphic > Metasedimentary > Metaclastic > QuartziteIncludes metachert
Metamorphic > Amphibolite
Metamorphic > Metaigneous > Serpentinite
Metamorphic > Metasedimentary > Metacarbonate > Marble
Comments Pelona, Orocopia, and Rand Schists of southern California; also includes part of schist of Sierra de Salinas in Gabilan Range of west-central California. Primarily quartz-mica schist interpreted as metagraywacke
Stratigraphic units Pelona Schist, Orocopia Schist, Rand Schist, Schist of Sierra de Salinas
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.

Jennings, C.W., and Strand, R.G., 1969, Geologic map of California, Olaf P. Jenkins edition, Los Angeles sheet, scale 1:250,000.

Jennings, C.W., 1967, Geologic map of California, Olaf P. Jenkins edition, Salton Sea sheet, scale 1:250,000.

Rogers, T.H., 1969, Geologic map of California, Olaf P. Jenkins edition, San Bernardino sheet, scale 1:250,000.

Strand, R.G., 1962, Geologic map of California, Olaf P. Jenkins edition, San Diego-El Centro 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., Burnett, J.L., and Troxel, B.W., 1963, Geologic map of California, Olaf P. Jenkins edition, Trona sheet, scale 1:250,000.

Ross, D.C., 1989, The metamorphic and plutonic rocks of the southernmost Sierra Nevada, California, and their tectonic framework: U.S. Geological Survey Professional Paper 1381, 159 p., scale 1:125,000.

https://pubs.er.usgs.gov/publication/pp1381

Powell, R.E., 1993, Balanced palinspastic reconstruction of pre-late Cenozoic paleogeology, southern California: Geologic and kinematic constraints on evolution of the San Andreas fault system, in Powell, R.E., Weldon, R.J., II, and Matti, J.C., eds., The San Andreas fault system: Displacement, palinspastic reconstruction, and geologic evolution: Geological Society of America Memoir 178, p. 1-106, scale 1:750,000.

Ross, D.C., 1972, Geologic map of the pre-Cenozoic basement rocks, Gabilan Range, Monterey and San Benito Counties, California: U.S. Geological Survey Miscellaneous Field Studies Map MF-357, scale 1:125,000.

https://pubs.er.usgs.gov/publication/mf357

Dillon, J.T., 1976, Geology of the Chocolate and Cargo Muchacho Mountains, southeasternmost California: Santa Barbara, University of California, Ph.D. thesis, 405 p.

Haxel, Gordon, and Dillon, John, 1978, The Pelona-Orocopia schist and Vincent-Chocolate Mountain thrust system, southern California, 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. 453-469.

Jacobson, C.E., Barth, A.P., and Grove, M., 2000, Late Cretaceous protolith age and provenance of the Pelona and Orocopia Schists, southern California: Implications for evolution of the Cordilleran margin: Geology, v. 28, p. 219-222.

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

Tosdal, R.M., Haxel, G.B., and Wright, J.E., 1989, Jurassic geology of the Sonoran Desert region, southern Arizona, southeastern California, and northernmost Sonora: construction of a continental-margin magmatic arc, in Jenney, J.P., and Reynolds, S.J., eds., Geologic evolution of Arizona: Arizona Geological Society Digest 17, p. 397-434.

Ehlig, P.L., 1981, Origin and tectonic history of the basement terrane of the San Gabriel Mountains, central Transverse Ranges, in Ernst, W.G., ed., The geotectonic development of California (Rubey Volume 1): Englewood Cliffs, N.J., Prentice-Hall, p. 253-283.

James, E.W., and Mattinson, J.M., 1988, Metamorphic history of the Salinian block: an isotopic reconnaissance, in Ernst, W.G., ed., Metamorphism and crustal evolution of the western United States (Rubey Volume 7): Englewood Cliffs, N.J., Prentice-Hall, p. 938-952.

Jacobson, C.E., Dawson, M.R., and Postlethwaite, C.E., 1988, Structure, metamorphism, and tectonic significance of the Pelona, Orocopia, and Rand Schists, southern 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. 976-997.

Ross, D.C., 1977, Pre-intrusive metasedimentary rocks of the Salinian block, California--a paleotectonic dilemma, in Stewart, J.H., Stevens, C.H., and Fritsche, A.E., eds., Paleozoic paleogeography of the western United States: Society of Economic Paleontologists and Mineralogists, Pacific Section, Pacific Coast Paleogeography Symposium 1, p. 371-380.

Postlethwaite, C.E., and Jacobson, C.E., 1987, Early history and reactivation of the Rand thrust, southern California: Journal of Structural Geology, v. 9, p. 195-205.

Ross, D.C., 1976, Metagraywacke in the Salinian block, central Coast Ranges, California--and a possible correlative across the San Andreas fault: U.S. Geological Survey Journal of Research, v. 4, no. 6, p. 683-696.

Grove, M., Jacobson, C.E., Barth, A.P., and Vucic, A., 2003, Temporal and spatial trends of Late Cretaceous-early Tertiary underplating of Pelona and related schist beneath southern California and southwest Arizona, in Johnson, S.E., Paterson, S.R., Fletcher, J.M., Girty, G.H., Kimbrough, D.L., and Martin-Barajas, A., eds., Tectonic evolution of northwestern Mexico and the southwestern USA: Geological Society of America Special Paper 374, p. 381-406.

NGMDB product
Counties Imperial - Kern - Los Angeles - Monterey - Riverside - San Bernardino