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Quimby Formation

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Black graphitic-sulfidic rusty-weathering schist and thickly bedded metagraywacke.
State New Hampshire
Name Quimby Formation
Geologic age Upper Ordovician?
Lithologic constituents
Major
Metamorphic > Schistblack graphitic-sulfidic rusty-weathering schist
Metamorphic > Metasedimentary > Metaclastic > Metasandstone > Metagraywackethickly bedded metagraywacke
Comments Part of the Central Maine Composite Terrane (Central Maine Trough) - Variably metamorphosed sedimentary and volcanic rocks of greenschist to granulite facies, locally migmatized. Area includes structural belts between the Monroe fault on the west and the Campbell Hill fault on the east; that is, the Bronson Hill anticlinorium, Piedmont allochthon, Kearsarge-central Maine synclinorium, central New Hampshire anticlinorium, and Rochester-Lebanon (Maine) antiformal synclinorium.
References

Lyons, J.B., Bothner, W.A., Moench, R.H., and Thompson, J.B., Jr., 1997, Bedrock Geologic Map of New Hampshire: Reston, VA, U.S. Geological Survey Special Map, 2 sheets, scale 1:250,000.

https://ngmdb.usgs.gov/Prodesc/proddesc_37338.htm
NGMDB product
Counties Grafton