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National Geologic Map Database

Geologic Unit: Brassfield

Usage:

Brassfield Limestone (AL*,AR*,IN*,KY*,MS,OH*,TN*)
Brassfield Dolomite (KY*,TN)
Brassfield Formation (KY*,OH,TN*)
Brassfield Formation of Cataract Group (OH)
Brassfield Limestone Member of Manitoulin Dolomite (OH)
Brassfield Member of Drowning Creek Formation (WV*)
Brassfield Member of Drowning Creek Formation of Crab Orchard Group (KY*,OH*)


Subunits:

FORMATION STATUS (alphabetical): Belfast Member (KY,IN,OH), Lee Creek Member (IN,KY).


Geologic age:

early Early Silurian (Llandovery)*


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

Type section: exposures along Louisville and Nashville RR between Brassfield and Panola, Madison Co., KY (Foerste, 1906).


AAPG geologic province:

Cincinnati arch*
Upper Mississippi embayment*
Appalachian 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 ([ ]).