Usage:
Mammoth Cave Group (IL,KY)
/Mammoth Cave megagroup [informal] (IN,KY)
["Megagroup" not recognized as a formal stratigraphic rank term (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). Considered informal and should not be capitalized.]
Subunits:
GROUP STATUS (alphabetical) --all in IL: Borden Siltstone, /Burlington-Keokuk Limestone, Chouteau Limestone, Fern Glen Formation, Fort Payne Formation, McCraney Limestone, Meppen Limestone, Prospect Hill Siltstone, St. Louis Limestone, Ste. Genevieve Limestone, Salem Limestone, Starrs Cave Formation, Warsaw Formation, Ullin Limestone.
/megagroup [informal] status (alphabetical): Blue River Group (IN).
Geologic age:
Mississippian
Type section, locality, area and/or origin of name:
Mammoth Cave, Edmonson Co., west-central KY (Miller, 1919).
AAPG geologic province:
Cincinnati arch
Appalachian basin
Illinois 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 ([ ]).