Cretaceous marine rocks (in part nonmarine) (?), unit 1 (Blythe)

Undivided Cretaceous sandstone, shale, and conglomerate; minor nonmarine rocks in Peninsular Ranges (?)
State California
Name Cretaceous marine rocks (in part nonmarine) (?), unit 1 (Blythe)
Geologic age Middle Jurassic(?) to Late Cretaceous
Lithologic constituents
Sedimentary > Clastic > Siltstone (Bed, Arkosic)Mostly arkosic to volcanic-lithic; orthoquartzitic in lower part of unit
Sedimentary > Clastic > Conglomerate (Bed)Clasts mainly granitic and volcanic
Sedimentary > Clastic > Mudstone (Bed)Generally phyllitic
Sedimentary > Clastic > SandstoneOccurs in thrust sheet above McCoy Mountains Formation
Comments Southeastern California (Palen and McCoy Mountains). Thick sequence composed primarily of weakly metamorphosed sandstone, conglomerate, and shale
Stratigraphic units McCoy Mountains 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.

Jennings, C.W., 1967, Geologic map of California, Olaf P. Jenkins edition, Salton Sea sheet, scale 1:250,000.

Stone, Paul, 1990, Preliminary geologic map of the Blythe 30' by 60' quadrangle, California and Arizona: U.S. Geological Survey Open-File Report 90-497, scale 1:100,000.

Fackler-Adams, B.N., Busby, C.J., and Mattinson, J.M., 1997, Jurassic magmatism and sedimentation in the Palen Mountains, southeastern California: implications for regional tectonic controls on the Mesozoic continental arc: Geological Society of America Bulletin, v. 109, p. 1464-1484.

Stone, Paul, and Pelka, G.J., 1989, Geologic map of the Palen-McCoy Wilderness Study Area and vicinity, Riverside County, California: U.S. Geological Survey Miscellaneous Field Studies Map MF-2092, scale 1:62,500.

Barth, A.P., Wooden, J.L., Jacobon, C.E., and Probst, K., 2004, U-Pb geochronology and geochemistry of the McCoy Mountains Formation, southeastern California: A Cretaceous retroarc foreland basin: Geological Society of America Bulletin, v. 116, p. 142-153.

NGMDB product
Counties Riverside