Usage:
Irwinton Sand (GA)
Irwinton Sand Member of Barnwell Formation (GA*)
Irwinton Sand Member of Dry Branch Formation (GA,SC)
Geologic age:
Tertiary*
Eocene, late*
Type section, locality, area and/or origin of name:
In gullies on Hatfield property 150 yds west of a cemetery, which is 0.3 mi south of courthouse at Irwinton along GA Highway 29, Wilkinson Co., east-central GA (LaMoreaux, 1946).
AAPG geologic province:
South Georgia sedimentary province*
Atlantic Coast basin
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 ([ ]).