Usage:
Marks Head Formation (GA*,SC*)
Marks Head Formation of Hawthorn Group (FL,GA)
Geologic age:
Tertiary*
Miocene, early*
Burdigalian
Type section, locality, area and/or origin of name:
Type section: exposures in Marks Head Run, a deeply incised ravine in the bluffs overlooking the floodplain of the Savannah River, 1.2 mi (1.9 km) northwest of Porters Landing, Effingham Co., GA (Sloan 1908).
AAPG geologic province:
Atlantic Coast basin*
South Georgia sedimentary province*
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 ([ ]).