State | Connecticut |
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Name | Foliated quartz diorite |
Geologic age | Devonian in part, probably Ordovician in part |
Lithologic constituents | Major
Metamorphic > Gneiss > Hornblende-gneissMainly dark-gray, medium-grained, well-foliated gneiss (locally strongly sheared, especially near contacts), composed of plagioclase, quartz, biotite, and hornblende, locally also pyroxene.
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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 | Tolland - Windham |