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

Complexly folded, locally highly foliated and recrystallized undifferentiated sedimentary and volcanic rocks that in places are lithologically similar to Jurassic and Triassic rocks in the Aldrich Mountains of the Blue Mountains province and in other places resemble Elkhorn Ridge Argillite, Clover Creek Greenstone, and Burnt River Schist (Gilluly, 1937). Age probably mostly Late Permian to Late Triassic, but, as shown, may include some Early Jurassic rocks
State Oregon
Name Sedimentary and volcanic rocks, partly metamorphosed (Triassic and Permian)
Geologic age Permian to Triassic
Comments As shown, may include some Jurassic rocks. Not shown on State map (OR001), but present in the La Grande 100K quadrangle (OR291) and Umatilla River Basin (OR292) as part of Mountain Home Metamorphic Complex is chlorite-mica schist of Permian and (or) Triassic-Jurassic age. Rocks include metamorphosed equivalents of sedimentary, silicic volcanic, and trondhjemite protoliths. Protoliths may be lower metamorphic grade equivalent of protoliths of biotite schist of Yellow Jacket Road. Map units include metatrondjemite, metatonalite, metagabbro, and hornblendite and hornblende gabbro.
Primary rock type meta-argillite
Secondary rock type greenstone
Other rock types slate
Lithologic constituents
Major
Metamorphic > Metasedimentary > Mixed-clastic (Greenschist)Lithologies not provided in OR001
Minor
Metamorphic > Greenstone > Mafic-volcanic (Greenschist)Lithologies not provided in OR001
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.
Gilluly, James, 1937, Geology and mineral resources of the Baker quadrangle, Oregon: U.S. Geological Survey Bulletin 879, 199 p.
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
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.
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.
Wolff, E.N., 1965, The geology of the northern half of the Caviness quadrangle, Oregon: Eugene, University of Oregon, Ph.D. dissertation, 214 p.
Prostka, H.J., 1968, Geologic map of the Ironside 15' quad, Oregon: Oregon Department of Geology and Mineral Industries, scale 1:62,500.
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.
Ferns, M.L., McConnell, V.S., and Madin, I.P., in prep., Geology of the Umatilla River Basin, Morrow, Umatilla, and Union Counties, Oregon: Oregon Department of Geology and Mineral Industries Open-File Report, 66 p., scale 1:100,000.
Madin, I.P., 1998, Geologic map of the Tucker Flat quadrangle, Union and Baker Counties, Oregon: Oregon Department of Geology and Mineral Industries Geological map Series GMS-110, scale 1;24,000.
Madin, I.P. and Taubeneck, W.H., 2003, Geologic map of the Amnthony Buttes quadrangle, Union and Baker Counties, Oregon: Oregon Department of Geology and Mineral Industries Geological Map Series GMS-107, scale 1:24,000.
Ferns, M.L. and Taubeneck, W.H., 1994, Geology and mineral resources of the Limber Jim Creek quadrangle, Union County, Oregon: Oregon Department of Geology and Mineral Industries Geological Map Series GMS-82, scale 1:24,000.
Counties Baker - Crook - Grant - Harney - Morrow - Umatilla - Union - Wallowa