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Silurian and/or Ordovician marine rocks, unit 3 (Eastern Klamath Mountains)

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Sandstone, shale, conglomerate, chert, slate, quartzite, hornfels, marble, dolomite, phyllite; some greenstone
State California
Name Silurian and/or Ordovician marine rocks, unit 3 (Eastern Klamath Mountains)
Geologic age Ordovician to Early Devonian
Lithologic constituents
Major
Metamorphic > Metasedimentary > Metaclastic > PhylliteIncludes phyllitic siltstone and shale
Minor
Sedimentary > Clastic > Siltstone (Bed)
Sedimentary > Clastic > Sandstone (Bed)
Metamorphic > Metasedimentary > Metaclastic > Quartzite
Sedimentary > Clastic > Mudstone (Bed)
Incidental
Sedimentary > Carbonate > Limestone (Bed)
Sedimentary > Chemical > Chert (Bed)
Sedimentary > Clastic > Conglomerate (Bed)
Comments Eastern Klamath Mountains. Stratigraphically and structurally complex rocks consisting primarily of shale, siltstone, and sandstone of deep-water turbidite facies; rocks are commonly phyllitic. Distribution and boundaries of unit shown on State map are much different than those shown by newer mapping, so it is difficult to determine exactly what formations and rock types are included
Stratigraphic units Gazelle Fm. (part), Duzel Fm. (part), Moffett Creek Fm. (part)
References

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., 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.

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

Potter, A.W., Hotz, P.E., and Rohr, D.M., 1977, Stratigraphy and inferred tectonic framework of lower Paleozoic rocks in the eastern Klamath Mountains, northern California, 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. 421-440.

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.

Potter, A.W., and others, 1990, Early Paleozoic stratigraphic, paleogeographic, and biogeographic relations of the eastern Klamath belt, 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. 57-74.
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