Usage:
Island Mill Formation (GA*)
Geologic age:
Precambrian*
Proterozoic, Late*
Cambrian*
Ordovician, Early*
Ordovician, Middle*
Type section, locality, area and/or origin of name:
Type section: outcrops along shore of Allatoona Reservoir from tip of Island Mill peninsula for 600 m northward along both sides of peninsula, Allatoona Dam 7.5-min quadrangle, Bartow Co., northwestern GA (Crawford and others, in press).
AAPG geologic province:
Appalachian basin*
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 ([ ]).