Usage:
Fentress Formation (TN*)
Fentress Shale (TN*)
Geologic age:
Early Pennsylvanian (Bashkirian; Namurian to Westphalian; Morrowan)*
Type section, locality, area and/or origin of name:
Type locality not stated, but presumably the beds were named from their development in Fentress Co., northern TN (US geologic names lexicons, USGS Bull. 896, 1200).
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 ([ ]).