Usage:
Krebs Group (AR*,KS*,MO, OK*)
Krebs Formation of Cherokee Group (KS*)
/Krebs subgroup [informal] of Cherokee Group (MO)
["Subgroup" not recognized as a formal stratigraphic rank term (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). Krebs subgroup considered informal and should not be capitalized.]
Subunits:
GROUP STATUS (alphabetical): Bluejacket Formation (OK), Boggy Shale (or Formation) (OK*), Drywood Formation (OK), Hartshorne Sandstone (or Formation) (OK*), McAlester Formation (OK*), McAlester Shale (KS*,OK*), Rowe Formation (MO), Savanna Formation (or Sandstone) (OK*), Savanna Shale (OK), Seville Formation (MO), Warner Formation (MO).
FORMATION STATUS: Bluejacket Sandstone Member (KS*), Warner Sandstone Member (KS*).
Geologic age:
Pennsylvanian, Middle*
Type section, locality, area and/or origin of name:
Not synopsized to date. [See US geologic names lexicon, USGS Bull. 1200]
AAPG geologic province:
Arkoma basin*
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 ([ ]).