Volcanic rocks (Triassic and Permian) (ORTRPv2;0)

State	Oregon
Name	Volcanic rocks (Triassic and Permian)
Geologic age	Permian to Triassic
Original map label	TRPv2
Primary rock type	intermediate metavolcanic rock
Secondary rock type	meta-basalt
Other rock types	spilite
Lithologic constituents	Major Igneous > Volcanic > Mafic-volcanic > Basalt (Flow) Igneous > Volcanic > Mafic-volcanic > Andesite (Flow)Contains meta-andesite, metabasalt, spilite, keratophyre, volcanic breccia, and volcaniclastic rocks Minor Igneous > Volcanic > Mafic-volcanic (Volcaniclastic, volcanic breccia) Metamorphic > Greenstone > Mafic-volcanic > Sandstone-Mudstone (Greenschist) Igneous > Volcanic (Flow)Keratophyre Igneous > Volcanic (Flow)Spilite
Map references	Walker, G.W. and MacLeod, N.S., 1991, Geologic map of Oregon: U.S. Geological Survey, scale 1:500,000.
Unit references	Walker, G.W. and MacLeod, N.S., 1991, Geologic map of Oregon: U.S. Geological Survey, scale 1:500,000. Brown, C.E. and Thayer, T.P., 1966, Geologic map of the Canyon City quadrangle, northeastern Oregon: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-447, scale 1:250,000. [http://pubs.er.usgs.gov/publication/i447] Prostka, H.J., 1962, Geology of the Sparta quadrangle, Oregon: Oregon Department of Geology and Mineral Industries Geologic Map Series GMS-1, scale 1:62,500. Gilluly, James, 1937, Geology and mineral resources of the Baker quadrangle, Oregon: U.S. Geological Survey Bulletin 879, 199 p. [http://pubs.er.usgs.gov/publication/b879] Brooks, H.C., McIntyre, J.R., and Walker, G.W., 1976, Geology of the Oregon part of the Baker 1o by 2o quadrangle: Oregon Department of Geology and Mineral Industries Geologic Map Series GMS-7, scale 1:250,000. Walker, G.W., 1979, Reconnaissance geologic map of the Oregon part of the Grangeville quadrangle, Baker, Union, Umatilla, and Wallowa Counties, Oregon: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-1116, scale 1;250,000 [http://pubs.er.usgs.gov/publication/i1116] Walker, G.W., 1973, Reconnaissance geologic map of the Pendleton quadrangle, Oregon and Washington: U.S. Geological Survey Miscellaneus Geologic Investigations Map I-727, scale 1:250,000. [http://pubs.er.usgs.gov/publication/i727] Walker, G.W., 1977, Geologic map of Oregon east of the 121st meridian: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-902, scale 1:500,000. [http://pubs.er.usgs.gov/publication/i902] Wolff, E.N., 1965, The geology of the northern half of the Caviness quadrangle, Oregon: Eugene, University of Oregon, Ph.D. dissertation, 214 p. Ashley, R.P., 1967, Metamorphic petrology and structure of the Burnt River Canyon area, northeastern Oregon: Stanford, California, Stanford University, Ph.D. dissertation, 236 p. Evans, J.G., 1989, Geologic map of the Desolation Butte quadrangle, Grant and Umatilla Counties, Oregon: U.S. Geological Survey Geologic Quadrangle GQ-1654, scale 1:62,500. [http://pubs.er.usgs.gov/publication/gq1654] Ferns, M.L., Madin, I.P., and Taubeneck, W.H., 2001, Reconnaissance geologic map of the La Grande 30' x 60' quadrangle, Baker, Grant, Umatilla, and Union Counties, Oregon: Oregon Department of Geology and Mineral Industries Reconnaissance Map Series RMS-1, 52 p., scale 1:100,000. Weiss, P.L., Gualtieri,, J.L., Cannon, W.F., Tucher, E.T., McMahan, A.B., and Federspiel, F.E., 1976, Mineral resources of the Eagle Cap Wilderness and adjacent areas, Oregon: U.S. Geological Survey Bulletin 1385-E, 100 p. [http://pubs.er.usgs.gov/publication/b1385E]
Geographic coverage	Baker - Grant - Umatilla - Union - Wheeler