Usage:
Barnwell Formation (GA*)
Barnwell Formation of Orangeburg Group (SC*)
Barnwell Group (GA*,SC*)
Barnwell Sand of Orangeburg Group (SC*)
Subunits:
Clinchfield Sand (GA*,SC*), Citronelle Formation (SC), Dry Branch Formation (GA*,SC*), and Tobacco Road Sand (GA*,SC*) of Barnwell Group; Twiggs Clay Member (GA*), Sandersville Limestone Member (GA*), Roberta Sandstone Member (GA), and Irwinton Sand Member (GA*) of Barnwell Formation.
Geologic age:
early Tertiary (late Eocene; Jacksonian; latest Bartonian-Priabonian NALMA)*
Type section, locality, area and/or origin of name:
Type area: Barnwell Co., SC (Sloan, 1905).
AAPG geologic province:
Atlantic Coast basin*
South Georgia sedimentary province*
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 ([ ]).