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National Geologic Map Database

Geologic Unit: McAlester

Usage:

McAlester Formation of Krebs Group (OK*)
McAlester Shale of Krebs Group (KS*,OK*)
McAlester Formation (AR*)


Subunits:

(alphabetical): Booch Sand Member (OK), Cameron Sandstone Member (OK*), Keota Sandstone Member (OK*), Lequire Sandstone Member (OK*), McCurtain Shale Member (OK*), Tamaha Sandstone Member (OK*), Warner Sandstone Member (KS*,OK*). [Also incl. the McAlester, or Stigler coal bed, and the Upper Hartshorne coal, which occurs near the base of the formation.]


Geologic age:

Middle Pennsylvanian (Desmoinesian)*


Type section, locality, area and/or origin of name:

Named from exposures around McAlester, Pittsburg Co., eastern OK (Taff, 1899).


AAPG geologic province:

Arkoma basin*
Chautauqua platform*


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

Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.

"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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).