No current usage?
(†Roan Gneiss (GA,NC,SC,TN) considered abandoned? Uncertain if used by GA, NC, SC, and TN Geol. Surveys. Not used by the USGS.)
Precambrian
Not designated. Named from development on Roan Mountain, Carter Co., northeastern TN (Keith, 1903).
Piedmont-Blue Ridge 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 ([ ]).