Oligocene volcanic rocks (UTTov;0)

State	Utah
Name	Oligocene volcanic rocks
Geologic age	Late Eocene to Oligocene
Original map label	Tov
Primary rock type	dacite
Secondary rock type	rhyolite
Other rock types	andesite; basalt
Lithologic constituents	Major Igneous > Volcanic > Felsic-volcanic (Pyroclastic, ash-flow) Minor Igneous > Volcanic > Felsic-volcanic (Flow) Igneous > Volcanic > Felsic-volcanic (Dome) Incidental Sedimentary > Clastic > Conglomerate (Bed) Igneous > Volcanic > Mafic-volcanic (Volcaniclastic) Sedimentary > Clastic > Mixed-clastic (Tuffaceous) Igneous > Volcanic > Felsic-volcanic (Volcaniclastic) Igneous > Hypabyssal (Dike or sill) Igneous > Volcanic > Felsic-volcanic (Pyroclastic, air fall) Igneous > Volcanic > Felsic-volcanic (Pyroclastic, tuff) Igneous > Volcanic > Mafic-volcanic (Flow)
Map references	Hintze, L.F., 1980, Geologic map of Utah: Utah Geological and Mineral Survey, scale 1:500,000.
Unit references	Hintze, L.F., 1980, Geologic map of Utah: Utah Geological and Mineral Survey, scale 1:500,000. Hintze, L.F., 1988, Geologic History of Utah: Brigham Young University Geology Studies Special Publication 7, 202 p. Stevens, T.A., Morris, H.T., and Rowley, P.D., 1990, Geologic map of the Richfield 1øx2ø quadrangle, west-central Utah: U.S. Geological Survey Map I-1901, scale 1:250,000. [http://pubs.er.usgs.gov/publication/i1901] Shubat, M.A., Felger, T.J., and King, J.K., 1999, Geologic map of the Keg Mountain Ranch quadrangle, Juab County, Utah: Utah Geological Survey Miscellaneous Publication 99-5, 22 p, scale 1:24,000 Hintze, L.F., and Davis, Fitzhugh D. D., 2002, Geologic map of the Tule Valley 30' x 60' quadrangle and parts of the Ely, Fish Springs, and Kern Mountains 30' by 60 quadrangles, northwest Millard County, Utah: Utah Geological Survey Map 186, scale 1:100,000. Oaks, R.Q., Jr., Smith, K.A., Janecke, S.U., Perkins, M.E., and Nash, W.P., 1999, Stratigraphy and tectonics of Tertiary strata of southern Cache Valley, north-central Utah: Utah Geological Association Publication 27, p. 71-110. Vogel, T.A., Cambray, F.W., and Constenius, K.N., 2001, Origin and emplacement of igneous rocks in the central Wasatch Mountains, Utah: Rocky Mountain Geology, v. 36, no. 2, p. 119-162. Bryant, B., 1990, Geologic map of the Salt Lake City 30' x 60' quadrangle, north-central Utah, and Uinta County, Wyoming: U.S. Miscellaneous Investigations Series Map I-1944, scale 1:100,000. Sable, E.G., and Maldonado, F., 1997, The Brian Head Formation (revised) and selected Tertiary sedimentary rock units, Markagunt Plateau and adjacent areas, southwestern Utah, in Maldonado, F., and Nealey, L.D., Geologic Studies in the Basin and Range-Colorado Plateau Transition in Southeastern Nevada, Southwestern Utah, and Northwestern Arizona, 1995: U.S. Geological Survey Bulletin 2153, p. 5-26. [http://pubs.er.usgs.gov/publication/b2153] Smith, K.A., Goessel, K.M., Oaks, R.Q., Jr; Perkins, M.E., and Nash, W. P., 1997, Lenticular Paleogene units in Cache Valley, Utah, constrain tectonic history of northeastern Basin-and-Range Province [abst.]: Geological Society of America Abstracts with Programs, v. 29, no. 6, p. 349. Rowley, P.D., Mehnert, H.H., Naeser, C.W., Snee, L.W., Cunningham, C.G., Steven, T.A., Anderson, J.J., Sable, E.G., and Anderson, R.E., 1994, Isotopic ages and stratigraphy of Cenozoic rocks in the Marysvale volcanic field and adjacent areas, west-central Utah : U.S. Geological Survey Bulletin 2071, 35 p. [http://pubs.er.usgs.gov/publication/b2071] Hintze, L.F., and Davis, F.D., 2002, Geologic map of the Wah Wah Mountains North 30' x 60' quadrangle and part of the Garrison 30' x 60' quadrangle, southwest Millard County and part of Beaver County, Utah: Utah Geological Survey Map 182, scale 1:100,000.
Geographic coverage	Beaver - Box Elder - Garfield - Iron - Juab - Kane - Millard - Morgan - Piute - Salt Lake - Sanpete - Sevier - Summit - Tooele - Utah - Wasatch - Washington - Wayne - Weber