Usage:
Helen Group (GA*,NC*)
Subunits:
(alphabetical) --all in GA*,NC*: Horton Formation, Nacoochee Formation, Robertstown Formation.
Geologic age:
Neoproterozoic and early Paleozoic*
Type section, locality, area and/or origin of name:
Type locality: exposures near the town of Helen, Helen 7.5-min quadrangle, White Co., GA (Gillon, 1982; see Nelson and Gillon, 1985).
AAPG geologic province:
Piedmont-Blue Ridge 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 ([ ]).