Tertiary volcanic flow rocks, unit 2 (Pinnacles-Neenach) (CATv2;0)

State	California
Name	Tertiary volcanic flow rocks, unit 2 (Pinnacles-Neenach)
Geologic age	Tertiary (22-24 Ma)
Original map label	Tv
Comments	two areas separated by San Andreas Fault system
Primary rock type	rhyolite
Secondary rock type	pyroclastic
Other rock types	andesite; dacite
Lithologic constituents	Major Igneous > Volcanic > Felsic-volcanic > Rhyolite (Flow) Minor Igneous > Volcanic > Felsic-volcanic > Rhyolite (Volcaniclastic, volcanic breccia) Incidental Igneous > Volcanic > Mafic-volcanic > Andesite (Volcaniclastic, volcanic breccia) Igneous > Volcanic > Mafic-volcanic > Andesite (Flow) Igneous > Volcanic > Felsic-volcanic > Dacite (Volcaniclastic, volcanic breccia) Igneous > Volcanic > Felsic-volcanic > Dacite (Flow) Igneous > Volcanic > Felsic-volcanic > Rhyolite (Pyroclastic)
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/] Matthews, V.,III, 1973, Geology of the Pinnacles volcanic formation and the Neenach volcanic formation and their bearing on the San Andreas fault problem. Unpublished Ph.D dissertation, University of California, Santa Cruz, Santa Cruz, CA. Weigand, P. W., and Thomas, J. M., 1989, Middle Cenozoic volcanic fields adjacent to the San Andreas fault, central California: Correlation and petrogenesis: in Baldwin, E. J., Foster, J. H., Lewis, W. L., and Hardy, J. K., eds., San Andreas fault - Cajon Pass to Wallace Creek: South Coast Geological Society Guidebook, no. 17, vol. 1, p. 207-222. Ludington, Steve, and Gray, Karen, 1987, Petrochemical studies of the Pinnacles Wilderness contiguous wilderness study area, Monterey and San Benito Counties, California. U.S. Geological Survey Open-file report 87-135, 9 p. [http://pubs.er.usgs.gov/publication/ofr87135] 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	Los Angeles - Monterey - San Benito