Wayne Formation (MS,TN*)
Wayne Group (AL,TN*)
Maddox (TN), Osgood Limestone (TN), Laurel Limestone (TN*), Waldron Clay (TN*), Lego Limestone (TN*), and Dixon Limestone (TN*) Members of Wayne Formation; Osgood Limestone (TN), Laurel Limestone (TN), Waldron Shale (TN), Lego Limestone (TN), and Dixon Formation or Limestone (TN) of Wayne Group
Silurian (Llandovery to Ludlow)
Not designated. Named from Wayne Co., western TN (Miser, IN Drake, 1914).
Cincinnati arch*
Upper Mississippi embayment*
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 ([ ]).