Usage:
Alum Bluff Group (AL*,FL*,GA*)
Subunits:
(alphabetical): Chipola Formation (FL*,GA*), Fort Preston sand (informal) (FL), Hawthorn Formation (FL*,GA*), Jackson Bluff Formation (FL), Oak Grove Sand (FL), Shoal River Formation (FL*).
Geologic age:
Tertiary*
Miocene, early*
Miocene, middle*
Type section, locality, area and/or origin of name:
Named from exposures at Alum Bluff on east side of Apalachicola River, [in sec. 24, T. 1 N., R. 8 W., Bristol 7.5-min quadrangle], Liberty Co., FL (US geologic names lexicons, USGS Bull. 896, 1200).
AAPG geologic province:
South Georgia sedimentary province*
Mid-Gulf Coast basin*
Florida platform*
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 ([ ]).