No current usage.
(Rocks of †Bryson Formation of Breathitt Group (KY*,TN*) reallocated to Cross Mountain Formation in TN, and to Breathitt Formation [or /Four Corners Formation of Breathitt Group] in KY. See Breathitt, Cross Mountain, and Four Corners.)
[Four Corners Formation conflicts with nomenclature guidelines (NACSN, 1983, 2005, 2021).]
Middle Pennsylvanian (early Moscovian; Westphalian B; middle Atokan)
Named from Bryson Peak, Claiborne Co., northeastern TN (US geologic names lexicons, USGS Bull. 896, 1200).
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 ([ ]).