Allingtown Metavolcanics plus Maltby Lakes Metavolcanics

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. Maltby Lakes Metavolcanics - Green to gray-green, fine-grained, massive to well-foliated and layered greenstone, greenschist, and schist; also dark amphibolite to west and southwest.
State Connecticut
Name Allingtown Metavolcanics plus Maltby Lakes Metavolcanics
Geologic age Middle? Ordovician
Lithologic constituents
Major
Metamorphic > Metaigneous > GreenstoneAllingtown Metavolcanics - Green, fine-grained, massive greenstone, composed of epidote, actinolite, albite, and chlorite, commonly with abundant megacrysts of saussurite. Maltby Lakes Metavolcanics - Green to gray-green, fine-grained, massive to well-foliated and layered greenstone.
Minor
Metamorphic > Metasedimentary > Metaclastic > PhylliteAllingtown Metavolcanics - interlayered with minor green phyllite, generally containing quartz and sericite.
Metamorphic > SchistMaltby Lakes Metavolcanics - greenschist, and schist.
Metamorphic > AmphiboliteMaltby Lakes Metavolcanics - dark amphibolite to west and southwest.
Comments Part of Central Lowlands; Iapetus (Oceanic) Terrane - Connecticut Valley Synclinorium; Units are described seperately on printed map; combined in digital map.
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 - New Haven