Persimmon Creek Gneiss of Coweeta Group named in Rabun Co., GA. Consists of orthoclase-quartz-biotite gneiss, either massive or interlayered with metasandstone and biotite-muscovite-quartz schist. Texture is coarse and even-grained. Forms exfoliated cliffs. Divided into informal lower and upper members. Thickness ranges from 1,300 to 2,000 m. Overlies Tallulah Falls Formation; underlies Coleman River Formation of Coweeta Group. Age is late Precambrian(?).
Source: GNU records (USGS DDS-6; Reston GNULEX).
Coweeta Group and its Persimmon Creek Gneiss, Coleman River Formation, and Ridgepole Mountain Formation are used informally in this report (local usage of Hatcher, 1979). Age changed from Late Proterozoic to Late Proterozoic and early Paleozoic. All formations are found in Richard Russell thrust sheet, east of Shope Fork fault.
Source: GNU records (USGS DDS-6; Reston GNULEX).
Rocks mapped as unnamed quartz diorite to tonalitic gneiss in this report may correlate with Persimmon Creek Formation of Hatcher (1979) in NC.
Source: GNU records (USGS DDS-6; Reston GNULEX).
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 ([ ]).