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Middletown Formation (CTOm;0)
Geologic Formation
in
CT
,
MA
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Lithology
Amphibolite
Granofels
Gneiss
Geologic Age
Middle Ordovician (471.4 Ma – 459.3 Ma ago)
Geologic Unit Label
Om
( = Ammonoosuc Volcanics of New Hampshire) - Heterogeneously interlayered dark- to light-gray, generally medium grained gneiss and granofels, ranging from quartz-biotite gneiss through felsic amphibole gneiss to amphibolite and characteristically containing anthophyllite or cummingtonite with or without hornblende. Also layers of calc-silicate rock and of biotite gneiss with quartz-sillimanite nodules.
—
USGS
Taxonomy
Classified As
Geologic Formation
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