Usage:
Crooked Fork Group (TN*)
Subunits:
(alphabetical) --all in TN*: Burnt Mill Shale, Coalfield Sandstone, Crossville Sandstone, Dorton Shale, Glenmary Shale, Wartburg Sandstone.
Geologic age:
Early Pennsylvanian (Bashkirian; Westphalian; Morrowan)*
Type section, locality, area and/or origin of name:
Type section: southeastward from Wartburg and along Crooked Fork, Morgan Co., eastern TN (Wilson and others, 1956).
AAPG geologic province:
Appalachian basin*
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 ([ ]).