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  • Usage in publication:
    • Cudahy Camp Formation
  • Modifications:
    • Named
    • Geochronologic dating
  • Dominant lithology:
    • Tuff
    • Andesite
    • Basalt
    • Conglomerate
  • AAPG geologic province:
    • Mojave basin
Publication:

Loomis, D.P., and Burbank, D.W., 1988, The stratigraphic evolution of the El Paso basin, southern California, implications for the Miocene development of the Garlock fault and uplift of the Sierra Nevada: Geological Society of America Bulletin, v. 100, no. 1, p. 12-28.


Summary:

Named as lower formation (of 2) of Ricardo Group for Cudahy Camp in Last Chance Canyon, El Paso basin, Kern Co, CA where type locality (Dibblee, 1967) is exposed. Rocks were formerly members 1 and 2 of Ricardo Formation of Dibblee (1952, 1967) and Black Mountain Basalt. Divided into 5 lithological units and Black mountain Basalt [Member?]. Consists of conglomerate, tuff, tuff-breccia, andesite, and basalt. Is 350 m thick. Unconformably overlies Goler Formation. Disconformably underlies Dove Spring Formation (new) of Ricardo Group. Age is early and middle Miocene based on radiometric ages ranging from 18.1 +/-1.2 Ma to 15.1 +/-0.5 Ma.

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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