Joshua Rock Member [of New London Gneiss]

Medium-gray (weathers with red spots of hematite), medium-grained, foliated gneiss composed of microperthite, quartz, albite, aegerine-augite, and magnetite; rare riebeckite.
State Connecticut
Name Joshua Rock Member [of New London Gneiss]
Geologic age Proterozoic Z?
Lithologic constituents
Major
Metamorphic > GneissMedium-gray (weathers with red spots of hematite), medium-grained, foliated gneiss composed of microperthite, quartz, albite, aegerine-augite, and magnetite; rare riebeckite.
Comments Part of Eastern Uplands; Avalonian (Continental) Terrane; Avalonian 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 - New London