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  • Usage in publication:
    • Nacoochee Formation*
  • Modifications:
    • Named
  • Dominant lithology:
    • Amphibolite
    • Schist
  • AAPG geologic province:
    • Piedmont-Blue Ridge province
Publication:

Nelson, A.E., and Gillon, K.A., 1985, Stratigraphic nomenclature in the Richard Russell and Helen thrust sheets, Georgia and North Carolina, IN Stratigraphic notes, 1984: U.S. Geological Survey Bulletin, 1605-A, p. A59-A62.


Summary:

The Nacoochee Formation of the Helen Group, informally named by Gillon (1982), is here named in the Helen thrust sheet in GA and NC. It consists of an interlayered sequence of amphibolite and graphitic-aluminous schist with minor micaceous metasandstone, feldspathic metasiltstone, epidote quartzite, and biotite schist. Grades into the Horton Formation of the Helen Group to the west and is truncated on the southeast by the Dahlonega fault. Age is tentatively Late Proterozoic to early Paleozoic.

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 ([ ]).

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