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Sedimentary rocks

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Black and gray mudstone, shale, siltstone, graywacke, andesitic to dacitic water-laid tuff, porcelaneous tuff, and minor interlayers and lenses of limestone and fine-grained sediments metamorphosed to phyllite or slate. Locally includes some felsite, andesite and basalt flows, breccia, and agglomerate. Marine invertebrate fauna indicates age range from Early Jurassic (Hettangian) to early Late Jurassic (Oxfordian). In Klamath Mountains of southwest Oregon, includes Galice Formation (Wells and Peck, 1961) and unnamed, hornblende- and (or) pyroxene-bearing clastic rocks of Jurassic age (Smith and others, 1982)
State Oregon
Name Sedimentary rocks
Geologic age Late Jurassic
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone (Bed)Commonly metamorposed to slate or phyllite
Sedimentary > Clastic > Sandstone > Graywacke (Bed)
Minor
Igneous > Volcanic (Pyroclastic)
Incidental
Igneous > Volcanic > Felsic-volcanic (Flow, Volcaniclastic)
Igneous > Volcanic > Mafic-volcanic > Basalt (Flow, Volcaniclastic)
Sedimentary > Carbonate > Limestone (Bed)
Igneous > Volcanic > Mafic-volcanic > Andesite (Flow, Volcaniclastic)
References

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

Irwin, W.P., 1994, Geologic map of the Klamath Mountains, California and Oregon: U.S. Geological Survey Miscellaneous Investigations Series Map I-2148, scale 1:500,000.

https://pubs.er.usgs.gov/publication/i2148

Saleeby, J..B., and Harper, G.D., 1993, Tectonic relations between the Galice Formation and the Condrey Mountain Schist, Klamath Mountains, Northern California, in Dunne, G.C., and McDougall, K.A., eds., Mesozoic paleogeography of the western United States - II: Pacific Section Society of Economic Paleontologists and Mineralogists, Book 71, p. 61-80.

Blake, M.C., Jr., Engebretson, D.C., Jayko, A.S., and Jones, D.L., 1985, Tectonostratigraphic terranes in southwest Oregon, in Howell, D.G., ed., Tectonostratigraphic terranes of the circum-Pacific region: Circum-Pacific Council for Energy and Mineral Resources Earth Science Series, v. 1, p. 147-158.

Dott, R.H., Jr., 1971, Geology of the southwestern Oregon coast west of the 124th meridian: Oregon Department of Geology and Mineral Industries Bulletin 69, 63 p.

Wells, F.G. and Peck, D.L., 1961, Geologic map of Oregon west of the 121st meridian: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-325, scale 1:500,000.

https://pubs.er.usgs.gov/publication/i325

Smith, J.G., Page, N.J, Johnson, M.G., Moring, B.C., and Gray, F., 1982, Preliminary geologic map of the Medford 1ø by 2ø quadrangle, Oregon and California: U.S. Geological Survey Open-File Report 82-955, scale 1:250,000.

https://pubs.er.usgs.gov/publication/ofr82955
NGMDB product
Counties Coos - Curry - Douglas - Jackson - Josephine