Partridge Formation, Interstratified metavolcanic rocks

Chiefly amphibolites, found in southwestern New Hampshire.
State New Hampshire
Name Partridge Formation, Interstratified metavolcanic rocks
Geologic age Middle - Upper Ordovician
Lithologic constituents
Major
Metamorphic > Metaigneous > Metavolcanic
Metamorphic > Amphibolite
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
NGMDB product
Counties Sullivan