Ammonoosuc Volcanics, Metabasalt

Ammonoosuc Volcanics, Metabasalt.
State New Hampshire
Name Ammonoosuc Volcanics, Metabasalt
Geologic age Middle - Upper Ordovician
Lithologic constituents
Major
Metamorphic > Metaigneous > Metavolcanic > Metabasalt
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. Ammonoosuc Volcanics, Moosilauke quadrangle, N.H. = 444+/-4 U/Pb per Aleinikoff, oral commun., Oct. 1991.
References
NGMDB product
Counties Coos - Grafton