|Geologic age||Proterozoic Y|
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""|
Rodgers, John, compiler, 1985, Bedrock Geological Map of Connecticut: Connecticut Geological and Natural History Survey, Hartford, Connecticut, 2 sheets, scale 1:125,000.
|Counties||Fairfield - Litchfield|