State | Connecticut |
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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 |