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- Usage in publication:
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- Laura Lake Mafic Complex
- Modifications:
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- Named
- Dominant lithology:
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- Amphibolite
- Gneiss
- Gabbro
- Iron-formation
- AAPG geologic province:
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- Piedmont-Blue Ridge province
Summary:
The largest premetamorphic intrusive-extrusive complex in the Piedmont portion of the Greater Atlanta Region is here named the Laura Lake Mafic Complex of the New Georgia Group. It is a body of migmatitic garnet amphibolite, clinopyroxene, felsic gneiss, metagabbro, meta-ultramafic rocks, and banded iron formation. It is separated from the outcrop belt of the New Georgia Group by a thin strip of Sandy Springs Group rocks. Because of lithologic similarities to the New Georgia, the Laura Lake is believed to represent a slice of the New Georgia that, along with the Sandy Springs, was thrust over other units of the New Georgia.
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 ([ ]).