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  • Usage in publication:
    • Colquitt formation
  • Modifications:
    • Named
  • Dominant lithology:
    • Clay
    • Limestone
  • AAPG geologic province:
    • Permian basin
Publication:

Adkins, W.S., 1933, The Mesozoic systems in Texas, Part 2, IN Sellards, E.H., Adkins, W.S., and Plummer, F.B, The geology of Texas; Volume 1, Stratigraphy: University of Texas Bulletin, no. 3232, p. 239-518., Published July, 1933


Summary:

Named as formation in the Chispa Summit-San Carlos region, western Jeff Davis Co, TX in the Permian basin of Trans-Pecos TX. Type locality is on the Colquitt ranch below Chispa Summit, Jeff Davis Co. Apparently named for Colquitt ranch. Is about 1,200 ft thick. Overlies Chispa Summit formation (new). Underlies Taylor clays. Between Chispa Summit and the abandoned San Carlos coal mine, is an almost entirely clay facies of the Austin formation, with small intercalated bodies of thin limestone flags. Is chalkier to the east; more crystalline to the west. Age is Coniacian and early Santonian (Late Cretaceous) as indicated in table on p. 271.

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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