State | Connecticut |
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Name | Felsic gneiss member [of Quinebaug Formation] |
Geologic age | Middle Ordovician or older |
Lithologic constituents | Major
Metamorphic > GneissLight- to medium-gray, fine- to medium-grained gneiss, composed of plagioclase, quartz, biotite, and muscovite, commonly with K-feldspar.
|
Comments | Part of Eastern Uplands; Iapetus (Oceanic) Terrane - Merrimack Synclinorium |
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 | New London - Windham |