State | Connecticut |
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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 | |
Counties | Fairfield - Hartford - Litchfield |