|Name||Ammonoosuc Volcanics, Bimodal volcanic rocks|
|Geologic age||Middle - Upper Ordovician|
Igneous > Volcanic > Felsic-volcanicBimodal volcanic rocks.
Igneous > Volcanic > Mafic-volcanicBimodal volcanic rocks.
|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.|