Usage:
Fort Preston Formation (FL)
Fort Preston sand (informal) of Alum Bluff Group (FL)
For informal usage, the rank or lithologic term should not be capitalized.
Geologic age:
Tertiary
Miocene, early
Hemingfordian
Miocene, middle
Barstovian
Type section, locality, area and/or origin of name:
Stop 54 (on road log) at Alum Bluff on Apalachicola River, near Bristol, Liberty Co., FL. Named from old Fort Preston (Puri and Vernon, 1964).
AAPG geologic province:
Florida platform
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 ([ ]).