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  • Usage in publication:
    • Mableton Amphibolite Member*
  • Modifications:
    • Named
  • Dominant lithology:
    • Amphibolite
  • AAPG geologic province:
    • Piedmont-Blue Ridge province
Publication:

Higgins, M.W., and McConnell, K.I., 1978, The Sandy Springs Group and related rocks in the Georgia Piedmont; nomenclature and stratigraphy, IN Sohl, N.F., and Wright, W.B., Changes in stratigraphic nomenclature by the U. S. Geological Survey, 1977: U.S. Geological Survey Bulletin, 1457-A, p. A98-A105.


Summary:

Named for exposures along and north of Fountain Road, just northeast of Mableton, GA. Named as a member of the Powers Ferry Formation. Consists of layered hornblende-plagioclase amphibolite. Higgins (1968) shows two disconnected belts of amphibolite within Powers Ferry unit, but recent work shows they are connected. Based on geologic mapping, thickness is about 500-700 m (1,640-2,300 ft). Age is late Precambrian and (or) early Paleozoic.

Source: GNU records (USGS DDS-6; Reston GNULEX).


Map showing publication footprint
  • Usage in publication:
    • Mableton Amphibolite Member*
  • Modifications:
    • Age modified
  • AAPG geologic province:
    • Piedmont-Blue Ridge province

Map showing publication footprint
  • Usage in publication:
    • Mableton Amphibolite Member†
  • Modifications:
    • Abandoned
  • AAPG geologic province:
    • Piedmont-Blue Ridge province
Publication:

Crawford, T.J., Higgins, M.W., Crawford, R.F., Atkins, R.L., Medlin, J.H., and Stern, T.W., 1999, Revision of stratigraphic nomenclature in the Atlanta, Athens, and Cartersville 30' x 60' quadrangles, Georgia: Georgia Geologic Survey Bulletin, no. 130, 45 p.


Summary:

Recent mapping has shown that rocks previously designated as Mableton Amphibolite Member of Powers Ferry Formation are actually part of Ropes Creek Metabasalt. Mableton is herein abandoned. Powers Ferry Formation is removed from Sandy Springs Group and reduced in rank to Powers Ferry Formation of Stonewall Gneiss (revised) also due to results of detailed mapping. Report includes geologic map and correlation chart.

Source: GNU records (USGS DDS-6; Reston GNULEX).


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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 ([ ]).