State | Connecticut |
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Name | Canterbury Gneiss |
Geologic age | Devonian |
Lithologic constituents | Major
Metamorphic > Gneiss > Biotite-gneissLight-gray, medium-grained, variably foliated, locally strongly lineated gneiss, composed of quartz, oligoclase, microcline, and biotite, locally also muscovite, or epidote, and generally with megacrysts 1 to 2 cm long of either or both feldspars.
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Comments | Part of Eastern Uplands; Iapetus (Oceanic) Terrane - Merrimack Synclinorium; May be equivalent to Ayer Granite of Massachusetts |
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 | Middlesex - New London - Tolland - Windham |