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Trap Falls Formation plus Ordovician? granitic gneiss (CTOtf+Og;0)
Geologic Formation
in
CT
,
NY
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Lithology
Granulite
Amphibolite
Schist
Other
(57 mi²)
Geologic Age
Early Ordovician – Middle Ordovician (487.3 Ma – 459.3 Ma ago)
Geologic Unit Label
Otf+Og
Trap Falls Formation (may be equivalent in part to Golden Hill Schist) - Gray to silvery, partly rusty weathering, medium-grained generally well layered schist, composed of quartz, sodic plagioclase, biotite, muscovite, and garnet, locally with sillimanite or kyanite, interlayered with two-mica gneiss and granulite and with amphibolite. Ordovician? granitic gneiss (including local terms Ansonia, Mine Hill, “Tyler Lake,” “Siscowit”) - White, light-gray, buff, or pink, generally foliated granitic gneiss, composed of sodic plagioclase, quartz, microcline, muscovite, and biotite, and locally garnet or sillimanite. Commonly contains numerous inclusions or layers of mica schist and gneiss.
—
USGS
Taxonomy
Classified As
Geologic Formation
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