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Southington Mountain Member [of The Straits Schist] (CTDSts;0)

Geologic Formation near Bristol, CT

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Lithology

Granofels

Schist

Geologic Age

Silurian – Devonian (445.3 Ma – 359.3 Ma ago)

Geologic Unit Label

DSts

Gray to silvery, non-rusty, medium-grained, well-layered alternating schist and granofels, composed of quartz, oligoclase, muscovite, biotite, and garnet, commonly with staurolite and kyanite (or sillimanite); schist commonly graphitic. Metamorphosed strata named Southington Mountain Schist by Fritts (1963) is traceable into southern Bristol quad., and is here revised as Southington Mountain Member of The Straits Schist. Consists of alternating bands of quartz-feldspar granulite and of graphitic, muscovite-biotite schist. Unit is characterized by distinct, widespread, graded bedding and locally abundant staurolite. Unit may correlate with the Goshen Formation of the Heath quad, MA-VT, of Middle Silurian to Early Devonian age (Simpson, 1990).

— USGS

Taxonomy

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Geologic Formation