|Name||Isom Fm, Needles Range Fm, and Bullion Canyon Volcanics|
|Geologic age||Late Eocene to Oligocene|
Igneous > Volcanic > Mafic-volcanic > Andesite (Pyroclastic-tuff, Volcaniclastic-volcanic breccia)Bullion Canyon volcanics, latitic and andesitic
Igneous > Volcanic > Felsic-volcanic (Pyroclastic-tuff, Pyroclastic-ash flow)mostly latite, but also dacite and rhyolite
Sedimentary > Clastic > Conglomerate (Bed)
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.
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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.
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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.
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.
|Counties||Beaver - Garfield - Iron - Kane - Millard - Piute - Sevier - Washington - Wayne|