State | Connecticut |
---|---|
Name | Upper member [of Middletown Formation] |
Geologic age | Middle Ordovician |
Lithologic constituents |
Major
Metamorphic > Granoblastic > GranofelsLight-gray, generally rusty weathering, well-layered gneiss and granofels, composed of oligoclase, quartz, biotite, and amphibole (cummingtonite, anthophyllite, gedrite, or hornblende, or several of these), also garnet and chlorite.
Metamorphic > GneissLight-gray, generally rusty weathering, well-layered gneiss and granofels, composed of oligoclase, quartz, biotite, and amphibole (cummingtonite, anthophyllite, gedrite, or hornblende, or several of these), also garnet and chlorite; also biotite gneiss.
Minor
Metamorphic > Amphibolite
|
Comments | Part of Eastern Uplands; Iapetus (Oceanic) Terrane - Bronson Hill Anticlinorium |
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 |