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National Geologic Map Database

Geologic Unit: Douglas

Usage:

Douglas Group (IA*,KS*,MO*,NE*, and CO*-subsurface)


Subunits:

(alphabetical): Cass Limestone (IA,NE) or Cass Formation (MO), Iatan Limestone (KS), Lawrence Formation (KS*,NE*,MO) or Lawrence Shale (IA*,KS*,MO*), Plattford Shale (NE), Stranger Formation (KS*,MO*,NE*).


Geologic age:

Late Pennsylvanian (Missourian to Virgilian)*


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

Named from Douglas Co., eastern KS (Haworth, 1898).


AAPG geologic province:

Anadarko basin*
Forest City basin*
Cherokee basin*


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 ([ ]).