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Tertiary volcanic flow rocks, unit 1 (Quien Sabe-Burdell Mountain)

Tertiary volcanic flow rocks; minor pyroclastic deposits.
State California
Name Tertiary volcanic flow rocks, unit 1 (Quien Sabe-Burdell Mountain)
Geologic age Tertiary (9.5-13 Ma)
Comments two areas separated by San Andreas Fault system
Primary rock type dacite
Secondary rock type andesite
Other rock types basalt; volcanic breccia (agglomerate)
Lithologic constituents
Minor
Igneous > Volcanic > Mafic-volcanic > Andesite (Flow)
Igneous > Volcanic > Felsic-volcanic > Dacite (Flow)
Igneous > Volcanic > Mafic-volcanic > Andesite (Volcaniclastic, volcanic breccia)
Igneous > Volcanic > Felsic-volcanic > Dacite (Volcaniclastic, volcanic breccia)
Incidental
Igneous > Volcanic > Mafic-volcanic > Andesite (Pyroclastic)
Igneous > Volcanic > Felsic-volcanic > Dacite (Pyroclastic)
Igneous > Volcanic > Mafic-volcanic > Basaltic-andesite (Flow)
Igneous > Volcanic > Mafic-volcanic > Basaltic-andesite (Volcaniclastic, volcanic breccia)
Igneous > Volcanic > Mafic-volcanic > Basalt (Flow)
Igneous > Volcanic > Mafic-volcanic > Basalt (Volcaniclastic, volcanic breccia)
Igneous > Volcanic > Felsic-volcanic > Rhyolite (Dome)
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
Drinkwater, J. L. and Sorg, D. H., and Weigand, P. W., 1988, Petrographic and chemical data for the Quien Sabe volcanic rocks in the Mariposa Peak Quadrangle, central Diablo Range, California: U.S. Geological Survey Open-File Report 88-642, 32 p.
Drinkwater, J.L., Sorg, D.H., and Russell, P.C., 1992, Geologic map showing ages and mineralization of Quien Sabe volcanics, Mariposa Peak quad, west-central California. U.S. Geological Survey Miscellaneous Field Investigations Map MF-2200.
Drinkwater, James, 1983, Geology of the northeastern part of the Quien Sabe volcanics, Merced County, California. Unpublished M.S. thesis, San Jos‚ State University, San Jos‚, California, 102 p.
Whitlock, Jaime S., 2002, Evidence of a mantle wedge source for slab window volcanism in the northern California coast ranges. Unpublished M.S. Thesis, the Pennsylvania State University, College Station, Pennsylvania, 78 p.
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.
Counties Marin - Merced - San Benito - Santa Clara - Sonoma