Usage:
Ison Branch Formation (GA*)
Geologic age:
Neoproterozoic(?) to Middle Ordovician(?)
Type section, locality, area and/or origin of name:
Type section: exposures in road cut in saprolite along Hill Street, north of its juncture with U.S. Highway 41/19 Business, on the north side of Ison Branch, near Griffin, Griffin South 7.5-min quadrangle, Spalding Co., GA (Higgins and others, 1988).
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 ([ ]).