Carboniferous marine rocks, unit 4 (Eastern Klamath Mountains)

Shale, sandstone, conglomerate, limestone, dolomite, chert, hornfels, marble, quartzite; in part pyroclastic rocks
State California
Name Carboniferous marine rocks, unit 4 (Eastern Klamath Mountains)
Geologic age Mississippian to Early Permian
Lithologic constituents
Sedimentary > Clastic > Mudstone (Bed)Ranges from nonfissile mudstone to thin-bedded, platy shale. In part tuffaceous
Igneous > Volcanic (Volcaniclastic-volcanic breccia, Pyroclastic-tuff)Volcanic breccia, tuff breccia, and tuff; includes andesite, keratophyre, and quartz keratophyre
Sedimentary > Clastic > Sandstone (Bed)Turbidites; in part tuffaceous
Sedimentary > Clastic > Conglomerate (Bed)Mostly chert-pebble conglomerate; also contains clasts of limestone, greenstone, shale, white quartz, and sandstone. Fills channels
Sedimentary > Carbonate > Limestone (Bed)Cherty limestone in Baird Fm.
Metamorphic > Metaigneous > GreenstoneMetamorphosed mafic lava in Baird Fm. (includes Bass Mountain Diabase)
Comments Eastern Klamath Mountains. Consists primarily of mudstone and pyroclastic rocks, with minor sandstone and conglomerate
Stratigraphic units Baird Fm., Bass Mountain Diabase (part), Bragdon Fm.

Jennings, C.W., Strand, R.G., Rogers, T.H., Boylan, R.T., Moar, R.R., and Switzer, R.A., 1977, Geologic Map of California: California Division of Mines and Geology, Geologic Data Map 2, scale 1:750,000.

Jennings, C.W., 1985, An explanatory text to accompany the 1:750,000 scale fault and geologic maps of California: California Division of Mines and Geology, Bulletin 201, 197 p.

Strand, R.G., 1962, Geologic map of California, Olaf P. Jenkins edition, Redding sheet, scale 1:250,000.

Strand, R.G., 1964, Geologic map of California, Olaf P. Jenkins edition, Weed sheet, scale 1:250,000.

Wagner, D.L., and Saucedo, G.J., 1987, Geologic map of the Weed quadrangle, California: California Division of Mines and Geology, Regional Geologic Map Series, Map 4A, scale 1:250,000.

Fraticelli, L.A., Albers, J.P., Irwin, W.P., and Blake, M.C., Jr., 1987, Geologic map of the Redding 1 X 2 degree quadrangle, Shasta, Tehama, Humboldt, and Trinity Counties, California: U.S. Geological Survey Open-File Report 87-257, scale 1:250,000.

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.

Irwin, W.P., 1977, Review of Paleozoic rocks of the Klamath Mountains, in Stewart, J.H., Stevens, C.H., and Fritsche, A.E., eds., Paleozoic paleogeography of the western United States: Society of Economic Paleontologists and Mineralogists, Pacific Section, Pacific Coast Paleogeography Symposium 1, p. 441-454.

Miller, M.M., and Harwood, D.S., 1990, Paleogeographic setting of upper Paleozoic rocks in the northern Sierra and eastern Klamath terranes, northern California, in Harwood, D.S., and Miller, M.M., eds., Paleozoic and early Mesozoic paleogeographic relations; Sierra Nevada, Klamath Mountains, and related terranes: Geological Society of America Special Paper 255, p. 175-192.

Albers, J.P., and Robertson, J.F., 1961, Geology and ore deposits of East Shasta copper-zinc district, Shasta County, California: U.S. Geological Professional Paper 338, 107 p., scale 1:24,000.

NGMDB product
Counties Shasta - Siskiyou - Trinity