Usage:
Sequatchie Formation (AL*,GA*,TN*,VA*)
Subunits:
Ringgold member (AL,GA), Shellmound Member (AL,GA), and Mannie Shale Member (AL,GA)
Geologic age:
Late Ordovician*
Type section, locality, area and/or origin of name:
Type area: Sequatchie Valley, eastern TN (Ulrich, 1912).
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 ([ ]).