Rowe Schist plus Amphibolite unit [in Rowe Schist]

Light-gray to silvery, fine- to medium-grained, generally poorly layered schist, composed of quartz, muscovite, biotite, oligoclase, and generally garnet, staurolite, and kyanite or sillimanite. Layers of granofels common; also some layers of amphibolite, quartz-spessartine rock (coticule), and calc-silicate rock. Amphibolite unit [in Rowe Schist] - Black or mottled, generally massive amphibolite and hornblende gneiss, composed of hornblende and andesine.
State Connecticut
Name Rowe Schist plus Amphibolite unit [in Rowe Schist]
Geologic age Lower Ordovician or Cambrian or both
Lithologic constituents
Major
Metamorphic > Gneiss > Hornblende-gneissBlack or mottled, generally massive amphibolite and hornblende gneiss, composed of hornblende and andesine.
Metamorphic > AmphiboliteBlack or mottled, generally massive amphibolite and hornblende gneiss, composed of hornblende and andesine.
Comments Part of Central Lowlands; Iapetus (Oceanic) Terrane - Connecticut Valley Synclinorium; Hartland Belt. On printed map unit OCra is seperate; combined on digital map.
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 Litchfield