Augen gneiss (CTYga;0)

Augen gneiss

(Including local term "Danbury Gneiss;" equivalent in part to Tyringham Gneiss of Massachusetts) - Medium-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.

State	Connecticut
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.
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	NGMDB product page for 54245
Counties	Fairfield - Litchfield

Augen gneiss

Rodgers, John, compiler, 1985, Bedrock Geological Map of Connecticut: Connecticut Geological and Natural History Survey, Hartford, Connecticut, 2 sheets, scale 1:125,000.