Lisbon Formation of Claiborne Group (AL*,FL*,GA*)
early Tertiary (middle Eocene)*
Named from exposures in Lisbon Bluff, on Alabama River, in Clarke Co., southwestern AL (US geologic names lexicons, USGS Bull. 896, 1200).
Mid-Gulf Coast basin*
South Georgia sedimentary province*
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 ([ ]).