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Tertiary pyroclastic and volcanic mudflow deposits, unit 4 (Tranquillon-Obispo)

Tertiary pyroclastic and volcanic mudflow deposits.
StateCalifornia
NameTertiary pyroclastic and volcanic mudflow deposits, unit 4 (Tranquillon-Obispo)
Geologic ageTertiary (16-18 Ma)
Original map labelTvp
Primary rock typerhyolite
Secondary rock typedacite
Other rock typestuff; volcanic breccia (agglomerate); ash-flow tuff; ignimbrite
Lithologic constituents
Major
Igneous > Volcanic > Felsic-volcanic > Rhyolite (Pyroclastic)
Minor
Igneous > Volcanic > Felsic-volcanic > Dacite (Pyroclastic)
Incidental
Igneous > Volcanic > Felsic-volcanic > Dacite (Volcaniclastic, volcanic breccia)
Igneous > Volcanic > Felsic-volcanic > Dacite (Pyroclastic, ash-flow)
Igneous > Volcanic > Felsic-volcanic > Rhyolite (Volcaniclastic, volcanic breccia)
Igneous > Volcanic > Felsic-volcanic > Rhyolite (Pyroclastic, ash-flow)
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
Luyendyk, B.P., Gans, P., and Kamerling, M.J., 1998, 40Ar/39Ar geochronology of Southern California Neogene volcanism. AAPG Bulleting, v. 82, p. 852 (abstract)
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/
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 coverageSan Luis Obispo - Santa Barbara

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