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Ultramafic rock

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Ultramafic rock, originally composed of olivine and pyroxene, now generally altered to tremolite, talc, chlorite, or serpentine.
State Connecticut
Name Ultramafic rock
Geologic age Ordovician or older
Lithologic constituents
Major
Igneous > Plutonic > UltramaficUltramafic rock, originally composed of olivine and pyroxene, now generally altered to tremolite, talc, chlorite, or serpentine.
Minor
Metamorphic > Metaigneous > SerpentiniteUltramafic rock, originally composed of olivine and pyroxene, now generally altered to tremolite, talc, chlorite, or serpentine.
Comments Part of Central Lowlands; Iapetus (Oceanic) Terrane - Connecticut Valley Synclinorium, and 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 Fairfield - Hartford - Litchfield - Middlesex - New Haven