State | Connecticut |
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Name | Walloomsac Schist |
Geologic age | Middle Ordovician |
Lithologic constituents | Major
Metamorphic > Metasedimentary > Metaclastic > PhylliteBlack to dark-or silvery-gray, rarely layered schist or phyllite, composed of quartz, albite, and commonly garnet and staurolite or sillimanite (locally strongly retrograded to chlorite and muscovite). Locally feldspathic or calcareous near the base.
Metamorphic > SchistBlack to dark-or silvery-gray, rarely layered schist or phyllite, composed of quartz, albite, and commonly garnet and staurolite or sillimanite (locally strongly retrograded to chlorite and muscovite). Locally feldspathic or calcareous near the base.
|
Comments | Part of Western Uplands; Proto-North American (Continental) Terrane - Carbonate Shelf |
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 |