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Geologic Unit: Three C
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Map showing publication footprint
  • Usage in publication:
    • Three C Member*
  • Modifications:
    • Named
  • Dominant lithology:
    • Sandstone
  • AAPG geologic province:
    • Basin-and-Range province
    • Pedregosa basin
Publication:

Creasey, S.C., 1967, General geology of the Mammoth quadrangle, Pinal County, Arizona: U.S. Geological Survey Bulletin, 1218, 94 p., (incl. geologic map, scale 1:48,000)


Summary:

Named a member of Abrigo Formation for the 3C Ranch of the Mammoth quad, Pinal Co, AZ in the Basin-and-Range province. Representative section measured in Nugget Canyon. 335 ft thick. Consists of reddish-brown, thin-bedded, largely fine-grained feldspathic sandstone, alternating with thin shale partings. Overlies Bolsa Quartzite. Overlain by Southern Belle Member of Abrigo Formation. Is of Cambrian age.

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


Map showing publication footprint
  • Usage in publication:
    • Three C Member*
  • Modifications:
    • Age modified
  • AAPG geologic province:
    • Basin-and-Range province
Publication:

Krieger, M.H., 1968, Stratigraphic relations of the Troy Quartzite (younger Precambrian) and the Cambrian formations in southeastern Arizona, IN Titley, S.R., ed., Southern Arizona guidebook III: Arizona Geological Society Guidebook, p. 22-32.


Summary:

Is a member of Abrigo Formation of northern Santa Catalina Mountains, AZ in the Basin-and-Range province. Is correlated with lower member of Abrigo Formation of other areas of southeastern AZ and is assigned a Middle Cambrian age.

Source: GNU records (USGS DDS-6; Denver 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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