Tertiary pyroclastic and volcanic mudflow deposits, unit 4 (Tranquillon-Obispo) (CATvp4;0)

State	California
Name	Tertiary pyroclastic and volcanic mudflow deposits, unit 4 (Tranquillon-Obispo)
Geologic age	Tertiary (16-18 Ma)
Original map label	Tvp
Primary rock type	rhyolite
Secondary rock type	dacite
Other rock types	tuff; 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/ [http://pubs.er.usgs.gov/publication/ofr00154] [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 coverage	San Luis Obispo - Santa Barbara