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National Geologic Map Database

Geologic Unit: St. Louis

Usage:

St. Louis Limestone (GA,IL*,IN*,IA*,KS*,KY*,MO*,OK*,TN*, and CO*-subsurface)
St. Louis Formation (IA,KS,TX)
St. Louis Limestone of Blue River Group (IN*)
St. Louis Limestone of Mammoth Cave Group (IL)
St. Louis Limestone Member of Greenbrier Limestone (VA)


Subunits:

FORMATION STATUS (alphabetical): Bronston Member (KY), Burnside Member (KY), Croton Member (IA), Horse Cave Limestone Member (KY) or Horse Cave Member (IN), Lost River Chert Bed (IN), Sisson Member (IN), Verdi Member (IA), Waugh Member (IA), Yenruogis Member (IA).


Geologic age:

Middle Mississippian (Visean; Meramecian)*


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

Named from exposures at St. Louis, MO (Englemann, 1847).


AAPG geologic province:

Appalachian basin*
Cincinnati arch*
Illinois basin*
Ozark uplift*


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 ([ ]).