State | Connecticut |
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Name | Augen gneiss |
Geologic age | Proterozoic Y |
Lithologic constituents | Major
Metamorphic > GneissMedium-gray to spotted, fine- to medium-grained, porphyritic, foliated and lineated granitic gneiss, composed of microcline (largely as megacrysts or augen up to 10 cm long), quartz, albite, or oligoclase, biotite and minor hornblende.
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Comments | Part of Western Uplands; Proto-North American (Continental) Terrane - Proterozoic Massifs - ""Grenville"" |
References | Rodgers, John, compiler, 1985, Bedrock Geological Map of Connecticut: Connecticut Geological and Natural History Survey, Hartford, Connecticut, 2 sheets, scale 1:125,000. |
NGMDB product | |
Counties | Fairfield - Litchfield |