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National Geologic Map Database

Geologic Unit: Golconda

Usage:

Golconda Formation (GA*,IL*,KY*,MO,TN*)
Golconda Formation of Pope Group (IL)
Golconda Limestone (KY)
Golconda Limestone of Stephensport Group (IN)


Subunits:

(ascending): Beech Creek Limestone Member (IL*,IN*,KY*,MO) or Beech Creek Member (KY*), Big Clifty Sandstone Member (IL*,KY*) or Big Clifty Member (KY*), Fraileys Shale Member (IL*,KY*,MO), Haney Limestone Member (IL*,IN*,KY*,MO).


Geologic age:

Middle Mississippian (Visean; early Chesterian)*


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

Named from Golconda, Pope Co., southeastern IL, just north of which the full thickness outcrops on the river bluff (Butts, 1917).


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 ([ ]).