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Geologic Units: Copper Basin
  • Usage in publication:
    • Copper Basin Formation
  • Modifications:
    • Named
  • Dominant lithology:
    • Sandstone
    • Conglomerate
    • Siltstone
    • Andesite
  • AAPG geologic province:
    • Basin-and-Range province
Publication:

Davis, G.A., Anderson, J.L., Frost, E.G., and Shackelford, T.J., 1980, Mylonitization and detachment faulting in the Whipple-Buckskin-Rawhide Mountains terrane, southeastern California and western Arizona, IN Crittenden, M.D., Jr., Coney, P.J., and Davis, G.H., eds., Cordilleran metamorphic core complexes: Geological Society of America Memoir, 153, p. 79-129.


Summary:

[Type section not stated.] Probably named for Copper Basin in east central Whipple Mountains, San Bernardino Co, CA. Consists of red sandstone, conglomerate, and siltstone with interbedded andesitic(?) volcanic rocks. Contains cross-bedding, ripple marks, and mudcracks. Upper unit in allochthonous upper-plate assemblage separated from lower-plate assemblage by subhorizontal detachment fault. Is 750 m thick. Unconformably overlies Gene Canyon Formation on east and south margins of Whipple Mountains, but overlies upper-plate crystalline basement rocks in central part of mountains; unconformably underlies Osborne Wash Formation (new). Is early Miocene age.

Source: GNU records (USGS DDS-6; Menlo GNULEX).


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates published by U.S. Geological Survey authors.

"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).

Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).

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