U.S. Geological Survey Home AASG Logo USGS HOME CONTACT USGS SEARCH USGS
National Geologic Map Database

Geologic Unit: Borden

Usage:

Borden Formation (IN*,KY*,OH*,TN*,WV*)
Borden Group (IN*,KY*)
Borden Siltstone of Knobs Group (IL-subsurface)


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*), Halls Gap Member (KY*), Henley Bed (KY), Holtsclaw Siltstone Member (KY*), Kenwood Siltstone Member (IN*,KY*), Muldraugh Member (IN*,KY*), Nada Member (KY)*, Nancy Member (KY*), New Providence Member (KY)*, Wildie Member (KY*).


Geologic age:

Early to Middle Mississippian (Tournaisian to Visean; Osagean)*


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 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 ([ ]).