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Marble

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Informally called the "Nelson marble" by Prostka (1967). Light-gray, fine-grained marble and medium- to dark-gray calcareous phyllite, exposed in a nearly continuous band from the Snake River westward through Nelson Station, about 6 km southeast of Durkee, and westward to the area north of Pedro Mountain, southern Baker County. Prostka (1967) considers the Nelson correlative with Upper Triassic Martin Bridge Formation of Ross (1938), whereas Ashley (1967) and Brooks and Vallier (1967) consider it older (Permian?) and stratigraphically and structurally related to Elkhorn Ridge Argillite and Burnt River Schist
State Oregon
Name Marble
Geologic age Permian to Triassic
Lithologic constituents
Major
Metamorphic > Metasedimentary > Metaclastic > Phyllite
Metamorphic > Metasedimentary > Metacarbonate > Marble (Greenschist)
Stratigraphic units Nelson marble (OR030)
References

Walker, G.W. and MacLeod, N.S., 1991, Geologic map of Oregon: U.S. Geological Survey, scale 1:500,000.

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.

Prostka, H.J., 1967, Preliminary geologic map of the Durkee quadrangle, Oregon: Oregon Department of Geology and Mineral Industries Geological Map Series GMS-3, scale 1, 62,500.

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., 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

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.

Ross, C.P., 1938, The geology of part of the Wallowa Mountains: Oregon Department of Geology and MIneral Industries Bulletin 3, 74 p.

Brooks, H.C. and Vallier, T.L., Progress report on the geology of part of the Snake River Canyon, Oregon and Idaho: The Ore Bin, v. 29, no. 12, p. 233-266.

Brooks, H.C., 1979, Geologic map of the Oregon part of the Mineral quadrangle: Oregon Department of Geology and Mineral Industries Geological Map Series GMS-12, scale 1:62,500.

Cummings, M.L., Evans, J.G., Ferns, M.L., and Lees, K.R., 2000, Evolution of the middle Miocene syntectonic Oregon-Idaho graben, southeast Oregon: Geological Society of America Bulletin, v. 112, no. 5, p. 668-682.
NGMDB product
Counties Baker - Grant