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Sedimentary and volcanic rocks, partly metamorphosed (Permian and Permian?)

Epiclastic and volcaniclastic rocks, chert, limestone, and lava flows of mid- or Early Permian(?) age that are moderately to intensely metamorphosed. Includes part of Hunsaker Creek Formation of Vallier (1977), in the eastern Blue Mountains province, composed mostly of keratophyre flows, keratophyric volcaniclastic rocks and minor spilite, mudstone, and limestone. In Wheeler County, includes phyllite, chert, and fusulinid-bearing crystalline limestone of probable Early Permian (Wolfcampian?) age (Oles and Enlows, 1971), associated with phyllite, chlorite, and muscovite schist, and lawsonite-crossite blueschist (Swanson, 1969b)
State Oregon
Name Sedimentary and volcanic rocks, partly metamorphosed (Permian and Permian?)
Geologic age Permian
Primary rock type fine-grained mixed clastic
Secondary rock type sandstone
Other rock types chert
Lithologic constituents
Major
Sedimentary > Clastic > Mixed-clastic > Conglomerate-sandstone (Bed)Contains Epiclastic and volcaniclastic rocks, mudstone, chert, limestone, lava flows (keratophyric), phyllite, chlorite and muscovite schist, and lawsonite-crossite blueschist
Minor
Sedimentary > Carbonate > Limestone (Bed)
Metamorphic > Metasedimentary (Greenschist)Keratophyre
Metamorphic > Metasedimentary (Glaucophane-schist)Lawsonite-crossite blueschist
Igneous > Volcanic (Flow)Spilite
Sedimentary > Clastic > Mudstone (Bed)
Igneous > Volcanic (Flow)
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.
Greene, R.C., Walker, G.W., and Corcoran, R.E., 1972, Geologic map of the Burns quadrangle, Oregon: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-680, scale 1:250,000.
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.
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
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.
Vallier, T.L., 1977, the Permian and Triassic Seven Devils Group, western Idaho and northeast Oregon: U.S. Geological Survey Bulletin 1437, 58 p.
Merriam, C.W. and Berthiaume, S.A., 1943, Late Paleozoic formations of central Oregon: Geological Society of America Bulletin, v. 54, p. 145-172.
Oles, K.F. and Enlows, H.E., 1971, Bedrock geology of the Mitchell quadrangle, Wheeler County, Oregon: Oregon Department of Geology and Mineral Industries Bulletin 72, 62 p.
Swanson, D.A., 1969b, Lawsonite blueschist from north-central Oregon: U.S. Geological Survey Professional Paper 650-B, p. B8-B11.
Kleweno, W.P. and Jeffords, R.M., 1961, Devonian rocks in the Suplee area of central Oregon [abs.]: Geological Society of America Special Paper 68, p. 34-35.
Mamay, S.H. and Read, C.B., 1956, Additions to the flora of the Spotted Ridge Formation in central Oregon: U.S. Geological Survey Professional Paper, 274-I, p. I211-I226.
Ferns, M.L., Brooks, H.C., and Avery, D.G., 1983, Geology and gold deposits map of the Greenhorn quadrangle, Baker and Grant Counties, Oregon: Oregon Department of Geology and Mineral Industries Geologic Map Series GMS-28, scale 1:24,000.
Brooks, H.C., Ferns, M.L., and Avery, D.G., 1984, Geology and gold deposits of the southwest quarter of the Bates quadrangle, Grant County, Oregon: Oregon Department of Geology and Mineral Industries Geological Map Series GMS-35, scale 1:24,000.
Brooks, H.C., Ferns, M.L., Wheeler, G.R., and Avery, D.G., 1983, Geology and gold deposits map of the northeast quarter of the Bates quadrangle, Baker and Grant Counties, Oregon: Oregon Department of Geology and Mineral Industries Geological Map Series GMS-29, scale 1:24,000
Counties Baker - Wallowa - Wheeler