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National Geologic Map Database
Geologic Unit: Senoia
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Map showing publication footprint
  • Usage in publication:
    • Senoia Formation*
  • Modifications:
    • Named
  • Dominant lithology:
    • Schist
    • Amphibolite
  • AAPG geologic province:
    • Piedmont-Blue Ridge province
Publication:

Higgins, M.W., and Atkins, R.L., 1981, The stratigraphy of the Piedmont southeast of the Brevard zone in the Atlanta, Georgia, area, IN Wigley, P.B., ed., Latest thinking on the stratigraphy of selected areas in Georgia; Volume 1: Georgia Geologic Survey Information Circular, no. 54-A, p. 3-40.


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).


Map showing publication footprint
  • Usage in publication:
    • Senoia Member*
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Piedmont-Blue Ridge province
Publication:

Higgins, M.W., Atkins, R.L., Crawford, T.J., Crawford, R.F., III, Brooks, Rebekah, and Cook, R.B., Jr., 1988, The structure, stratigraphy, tectonostratigraphy, and evolution of the southernmost part of the Appalachian Orogen, Georgia and Alabama: U.S. Geological Survey Professional Paper, 1475, 173 p., (incl. geologic map, scale 1:500,000)


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 usage by the U.S. Geological Survey. Other usages by state geological surveys.

"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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).