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 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 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 ([ ]).