Usage:
Ridley Limestone of Stones River Group (GA*,TN*)
Geologic age:
Late Ordovician (Mohawkian; Turinian)*
Type section, locality, area and/or origin of name:
Named from Judge Ridley's (now Davis) mill near Old Jefferson, Rutherford Co., TN (Safford, 1869).
Type section: river bluff downstream from Davis mill, across Jefferson-Lascassas Road, along secondary road south and up hill behind first house on right (Wilson, 1949).
AAPG geologic province:
Appalachian basin*
Cincinnati arch*
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 ([ ]).