Perry Mountain Formation, undivided

Sharply interbedded quartzites, light-gray nongraphitic metapelite, and "fast-graded" meta-turbidites. Coticule layers common.
State New Hampshire
Name Perry Mountain Formation, undivided
Geologic age Lower? - Middle? Silurian
Lithologic constituents
Metamorphic > Metasedimentary > Metaclastic > Quartzitesharply interbedded quartzites
Metamorphic > Metasedimentarynongraphitic metapelite, and "fast-graded" meta-turbidites
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.
NGMDB product
Counties Belknap - Carroll - Cheshire - Coos - Grafton - Hillsborough - Merrimack - Rockingham - Strafford