- Usage in publication:
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- Centralhatchee Formation
- Modifications:
-
- Named
- Dominant lithology:
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- Metagraywacke
- Schist
- AAPG geologic province:
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- Piedmont-Blue Ridge province
Summary:
Centralhatchee Formation is the southeasternmost unit of the Heard Group and is named for numerous exposures in the vicinity of Centralhatchee, Heard Co., GA. Unit is characterized by interlayered fine-grained biotite-oligoclase-quartz gneiss (metagraywacke) and coarse-grained muscovite-biotite-garnet-quartz-feldspathic schist. Weathering produces a reddish-orange soil. Formation is extensive in Fulton, Carroll, Douglas, and Heard Cos., GA, and Randolph, Tallapoosa, and Elmore Cos., AL. Mapped previously as part of the Carolina Gneiss. Gradationally adjoins Glenloch Formation (new), also of Heard Group, to the north. Centralhatchee is probably the youngest of the three formations that make up the newly named Heard Group, while the Roopville is the oldest. Age considered Precambrian and early Paleozoic.
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
-
- Centralhatchee Formation
- Modifications:
-
- Age modified
- AAPG geologic province:
-
- Piedmont-Blue Ridge province
Summary:
Age according to the geochronology of G.S. Russell is Cambrian or older.
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 ([ ]).