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National Geologic Map Database

Geologic Unit: Lisbon

Usage:

Lisbon Formation of Claiborne Group (AL*,FL*,GA*)


Geologic age:

early Tertiary (middle Eocene)*


Type section, locality, area and/or origin of name:

Named from exposures in Lisbon Bluff, on Alabama River, in Clarke Co., southwestern AL (US geologic names lexicons, USGS Bull. 896, 1200).


AAPG geologic province:

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 ([ ]).