Sedimentary and volcanic rocks, partly metamorphosed

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
Geologic age Permian
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
Sedimentary > Chemical > Chert (Bed)
Igneous > Volcanic (Volcaniclastic-volcanic breccia, Flow)Keratophyric
Minor
Metamorphic > Schist (Glaucophane-schist)Lawsonite-crossite blueschist
Metamorphic > Metasedimentary (Greenschist)Keratophyre
Sedimentary > Carbonate > Limestone (Bed)
Metamorphic
Sedimentary > Clastic > Mudstone (Bed)
Stratigraphic units Hunsaker Creek Formation (OR075)
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.

https://pubs.er.usgs.gov/publication/i680

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.

https://pubs.er.usgs.gov/publication/i447

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.

https://pubs.er.usgs.gov/publication/i1116

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.

https://pubs.er.usgs.gov/publication/i902

Vallier, T.L., 1977, the Permian and Triassic Seven Devils Group, western Idaho and northeast Oregon: U.S. Geological Survey Bulletin 1437, 58 p.

https://pubs.er.usgs.gov/publication/b1437

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.

https://pubs.er.usgs.gov/publication/pp650B

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.

https://pubs.er.usgs.gov/publication/pp274I

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

NGMDB product
Counties Baker - Wallowa - Wheeler