Silurian and/or Ordovician marine rocks, unit 4 (Northern Sierra Nevada)

Sandstone, shale, conglomerate, chert, slate, quartzite, hornfels, marble, dolomite, phyllite; some greenstone
State California
Name Silurian and/or Ordovician marine rocks, unit 4 (Northern Sierra Nevada)
Geologic age Ordovician to Devonian
Lithologic constituents
Metamorphic > Metasedimentary > Metaclastic > Slate
Metamorphic > Metasedimentary > Metaclastic > Phyllite
Sedimentary > Clastic > Sandstone > Graywacke (Melange)
Sedimentary > Clastic > Sedimentary-breccia (Melange)
Sedimentary > Chemical > Chert (Melange)
Sedimentary > Carbonate > Limestone (Melange)Fossiliferous limestone blocks originally named Montgomery Limestone
Comments Northern Sierra Nevada. Melange composed primarily of slate and phyllite, with minor graywacke, chert, and limestone. Originally mapped as Taylorsville Fm. and Montgomery Ls; later assigned to Shoo Fly Complex
Stratigraphic units Taylorsville Fm., Montgomery Limestone, Shoo Fly Complex

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.

Lydon, P.A., Gay, T.E., Jr., and Jennings, C.W., 1960, Geologic map of California, Olaf P. Jenkins edition, Westwood sheet, scale 1:250,000.

Harwood, D.S., 1992, Stratigraphy of Paleozoic and lower Mesozoic rocks in the Northern Sierra Terrane, California: U.S. Geological Survey Bulletin 1957, 78 p., scale 1:250,000.

D'Allura, J.A., Moores, E.M., and Robinson, L., 1977, Paleozoic rocks of the northern Sierra Nevada: their structural and paleogeographic implications, 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. 395-408.

Grose, T.L.T., Saucedo, G.J., and Wagner, D.L., 1990, Geologic map of the Susanville quadrangle, Lassen and Plumas Counties, California: California Division of Mines and Geology, Open-File Report 91-1, 25 p., scale 1:100,000.

McMath, V.E., 1966, Geology of the Taylorsville area, northern Sierra Nevada, in Bailey, E.H., ed., Geology of northern California: California Division of Mines and Geology Bulletin 190, p. 173-183.

NGMDB product
Counties Plumas