Tertiary volcanic flow rocks, unit 8 (Southern California Basin) (CATv8;0)

State	California
Name	Tertiary volcanic flow rocks, unit 8 (Southern California Basin)
Geologic age	Tertiary (8-25 Ma; most near 15)
Original map label	Tv
Primary rock type	basalt
Secondary rock type	andesite
Other rock types	dacite; volcanic breccia (agglomerate); tuff
Lithologic constituents	Minor Igneous > Volcanic > Mafic-volcanic > Andesite (Flow) Igneous > Volcanic > Mafic-volcanic > Basaltic-andesite (Flow) Igneous > Volcanic > Mafic-volcanic > Basalt (Flow) Igneous > Volcanic > Mafic-volcanic > Basalt (Volcaniclastic, volcanic breccia) Incidental Igneous > Volcanic > Felsic-volcanic > Dacite (Flow) Igneous > Volcanic > Felsic-volcanic > Dacite (Volcaniclastic, volcanic breccia) Igneous > Volcanic > Felsic-volcanic > Dacite (Pyroclastic, air fall) Igneous > Volcanic > Mafic-volcanic > Andesite (Pyroclastic, air fall) Igneous > Volcanic > Mafic-volcanic > Andesite (Volcaniclastic, volcanic breccia) Igneous > Volcanic > Mafic-volcanic > Basaltic-andesite (Volcaniclastic, volcanic breccia) Igneous > Volcanic > Mafic-volcanic > Basaltic-andesite (Pyroclastic, air fall) Igneous > Volcanic > Mafic-volcanic > Basalt (Pyroclastic, air fall)
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	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/ [http://pubs.er.usgs.gov/publication/ofr00154] [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., and Rogers, T.H., 1977, Geologic map of California: California Division of Mines and Geology, scale 1:750,000.
Geographic coverage	Kern - Los Angeles - Orange - San Diego - Santa Barbara - Ventura