Oronoque Schist

Gray to silver, medium- to fine-grained, well-layered to laminated schist and granofels, composed of quartz, oligoclase, or albite, muscovite or sericite, biotite, or chlorite, and in western belt local garnet, staurolite, and kyanite. Small lenses of amphibolite or greenstone.
State Connecticut
Name Oronoque Schist
Geologic age Lower? Ordovician
Lithologic constituents
Major
Metamorphic > SchistGray to silver, medium- to fine-grained, well-layered to laminated schist and granofels, composed of quartz, oligoclase, or albite, muscovite or sericite, biotite, or chlorite, and in western belt local garnet, staurolite, and kyanite.
Metamorphic > Granoblastic > GranofelsGray to silver, medium- to fine-grained, well-layered to laminated schist and granofels, composed of quartz, oligoclase, or albite, muscovite or sericite, biotite, or chlorite, and in western belt local garnet, staurolite, and kyanite.
Incidental
Metamorphic > Metaigneous > GreenstoneSmall lenses of amphibolite or greenstone.
Metamorphic > AmphiboliteSmall lenses of amphibolite or greenstone.
Comments Part of Central Lowlands; Iapetus (Oceanic) Terrane - Connecticut Valley Synclinorium; Orange-Milford Belt. Equivalents of Savoy Schist of Massachusetts (Emerson, 1898, 1917) (CT009, CT010) and of Moretown Formation of Vermont and Massachusetts (Bedrock Geologic Map of Massachusetts, Zen and others, 1983) (CT011) (includes Oronoque Schist) (Lower? Ordovician)
References
NGMDB product
Counties Fairfield - New Haven