Allingtown Metavolcanics

Green, fine-grained, massive greenstone, composed of epidote, actinolite, albite, and chlorite, commonly with abundant megacrysts of saussurite, interlayered with minor green phyllite, generally containing quartz and sericite. Dark amphibole in western outcrops.
State Connecticut
Name Allingtown Metavolcanics
Geologic age Middle? Ordovician
Lithologic constituents
Major
Metamorphic > Metaigneous > GreenstoneGreen, fine-grained, massive greenstone, composed of epidote, actinolite, albite, and chlorite, commonly with abundant megacrysts of saussurite.
Minor
Metamorphic > Metasedimentary > Metaclastic > Phylliteinterlayered with minor green phyllite, generally containing quartz and sericite
Comments Part of Central Lowlands; Iapetus (Oceanic) Terrane - Connecticut Valley Synclinorium; Orange-Milford Belt
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 New Haven