Usage:
Borden Group (IN*,KY*)
Borden Formation (IN*,KY*,OH*,TN*,WV*)
Borden Siltstone of Mammoth Cave Group (IL-northern part)
Borden Siltstone of Knobs Group (IL-southern part)
Subunits:
GROUP STATUS (alphabetical): Carwood Formation (IN*,KY), Edwardsville Formation (IN*), Floyds Knob Formation (IN*,KY*), Locust Point Formation (IN*), Muldraugh Formation (IN), New Providence Shale (IN*,KY*), Spickert Knob Formation (IN).
FORMATION STATUS (alphabetical): Bilyeu Member (IL), Cowbell Member (KY*,OH), Farmers Member (OH), Halls Gap Member (KY*), Henley bed (informal) (KY) or Henley Member (OH), Holtsclaw Siltstone Member (KY*), Kenwood Siltstone Member (IN*,KY*), Muldraugh Member (IN*,KY*), Nada Member (KY)*, Nancy Member (KY*,OH), New Providence Member (KY)*, Portsmouth Shale Member (OH), Wildie Member (KY*).
Geologic age:
Early to Middle Mississippian (Tournaisian to Visean; Kinderhookian to Meramecian)*
Type section, locality, area and/or origin of name:
Vicinity of Borden, Clark Co., IN (Cumings, 1922).
AAPG geologic province:
Appalachian basin*
Cincinnati arch*
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 ([ ]).