Clough Quartzite (NHSc;0)

Clough Quartzite

Orthoquartzite, quartz metaconglomerate, muscovite schist, minor polymictic metaconglomerate. Disconformable below Fitch Formation and unconformable on Ordovician formations. Equivalent, in part, to member C of Rangeley Formation of Maine. Fossiliferous.

State	New Hampshire
Name	Clough Quartzite
Geologic age	Lower Silurian (upper Llandoverian)
Lithologic constituents	Major Metamorphic > Metasedimentary > Metaclastic > Metaconglomeratequartz metaconglomerate; minor polymictic metaconglomerate Metamorphic > Metasedimentary > Metaclastic > Quartziteorthoquartzite Minor Metamorphic > Schist > Mica-schist > Muscovite-schist
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	NGMDB product page for 37338
Counties	Cheshire - Grafton - Sullivan

Clough Quartzite

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.