Rusty mica schist and gneiss (CTYgs;0)

Rusty mica schist and gneiss

(Equivalent in part to Washington Gneiss of Massachusetts) - Dark-gray, rusty-weathering, well-foliated and well- to poorly layered schist and gneiss composed of quartz, plagioclase, biotite, muscovite, sillimanite, and locally garnet; some layers of feldspathic quartzite and garnetiferous amphibolite.

State	Connecticut
Name	Rusty mica schist and gneiss
Geologic age	Proterozoic Y; may contain some older rocks
Lithologic constituents	Major Metamorphic > GneissDark-gray, rusty-weathering, well-foliated and well- to poorly layered schist and gneiss composed of quartz, plagioclase, biotite, muscovite, sillimanite, and locally garnet. Minor Metamorphic > SchistDark-gray, rusty-weathering, well-foliated and well- to poorly layered schist and gneiss composed of quartz, plagioclase, biotite, muscovite, sillimanite, and locally garnet. Incidental Metamorphic > Metasedimentary > Metaclastic > Quartzitesome layers of feldspathic quartzite Metamorphic > Amphibolitesome layers of garnetiferous amphibolite
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 - Hartford - Litchfield

Rusty mica schist and gneiss

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