Tertiary volcanic flow rocks, unit 8 (Southern California Basin)

Tertiary volcanic flow rocks; minor pyroclastic deposits.
State California
Name Tertiary volcanic flow rocks, unit 8 (Southern California Basin)
Geologic age Tertiary (8-25 Ma; most near 15)
Lithologic constituents
Igneous > Volcanic > Mafic-volcanic > Andesite (Flow, Volcaniclastic-volcanic breccia, Pyroclastic)
Igneous > Volcanic > Mafic-volcanic > Basalt (Flow, Volcaniclastic-volcanic breccia, Pyroclastic)
Igneous > Volcanic > Mafic-volcanic > Basaltic-andesite (Flow, Volcaniclastic-volcanic breccia, Pyroclastic)
Igneous > Volcanic > Felsic-volcanic > Dacite (Flow, Volcaniclastic-volcanic breccia, Pyroclastic)
Stratigraphic units Glendora Volcanics (part), Conejo Volcanics (part), El Modeno Volcanics (part),

Stanley, R.G., Wilson, D.S., and McCrory, P.A., 2000, Locations and ages of middle Tertiary volcanic centers in coastal California: U.S. Geological Survey Open-File Report 00-154, 27 p., url http://geopubs.wr.usgs.gov/open-file/of00-154/


Weigand, P.W., 1982, Middle Cenozoic volcanism of the western Transverse Ranges, in Fife, D. L., and Minch, J. A., eds., Geology and mineral wealth of the California Transverse Ranges: Santa Ana, California, South Coast Geological Society, Inc., p. 170-188.

Weigand, P.W., 1993, Geochemistry and origin of middle Miocene volcanic rocks from Santa Cruz and Anacapa Islands, southern California Borderland, in Hochberg, F. G., ed., Recent advances in California island research: Santa Barbara Museum of Natural History, p. 21-37.

Weigand, P.W., and Savage, K.L., 1993, Review of the petrology and geochemistry of the Miocene Conejo Volcanics of the Santa Monica Mountains, California, in Weigand, P. W., Fritsche, A. E., and Davis, G. E., eds., Miocene sedimentary and volcanic environments, Santa Monica Mountains, California: SEPM (Society for Sedimentary Geology), Pacific Section, Book 72, p. 93-112.

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.

NGMDB product
Counties Kern - Los Angeles - Orange - San Diego - Santa Barbara - Ventura