|Name||Ratlum Mountain Schist|
|Geologic age||Lower Ordovician|
Metamorphic > SchistGray, medium-grained, interlayered schist and granofels, composed of quartz, oligoclase, muscovite (in the schist), biotite, and garnet, also staurolite and kyanite in the schist.
Metamorphic > Granoblastic > GranofelsGray, medium-grained, interlayered schist and granofels, composed of quartz, oligoclase, biotite, and garnet.
Metamorphic > Amphibolite
Metamorphic > Metasedimentary > Calc-silicate-rocksome of quartz-spessartine (coticule) and calc-silicate rock
|Comments||Part of Central Lowlands; Iapetus (Oceanic) Terrane - Connecticut Valley Synclinorium; Equivalents of Savoy Schist of Massachusetts (Emerson, 1898, 1917) and of Moretown Formation of Vermont and Massachusetts (Bedrock Geologic Map of Massachusetts, Zen and others, 1983) (includes Golden Hill and Ratlum Mountain Schists) (Lower? Ordovician). Same as Or|
Rodgers, John, compiler, 1985, Bedrock Geological Map of Connecticut: Connecticut Geological and Natural History Survey, Hartford, Connecticut, 2 sheets, scale 1:125,000.