- Usage in publication:
-
- Senoia Formation*
- Modifications:
-
- Named
- Dominant lithology:
-
- Schist
- Amphibolite
- AAPG geologic province:
-
- Piedmont-Blue Ridge province
Summary:
The Senoia Formation of the Atlanta Group, here named in the Newnan-Tucker synform near Atlanta, GA, consists of garnet-biotite-muscovite schist interlayered with fine-grained hornblende-plagioclase amphibolite. Its lower contact has not been mapped. It sharply and conformably underlies the Wahoo Creek Formation. It is correlative with most of the Clairmont Formation. Age is Late Proterozoic and (or) early Paleozoic.
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
-
- Senoia Member*
- Modifications:
-
- Revised
- AAPG geologic province:
-
- Piedmont-Blue Ridge province
Summary:
The Senoia Formation of the Atlanta Group, here abandoned, is revised as the Senoia Member of the Zebulon Formation. It is a thin, <1 m thick interval of gondite (Spessartine quartzite) and magnetite-bearing gondite beds in the upper part of the Zebulon Formation, and it has been mapped with the Zebulon in many areas of the Zebulon thrust sheet in Georgia and Alabama. Age is Late Proterozoic to Early Ordovician(?).
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 ([ ]).