members from each other. The unit is heavily intruded by many dikes, sills, and small sections of gneiss and schist.

Mineralogy

While there are many different rock types in the Ammonoosuc Volcanics, there are two dominant lithologies and mineralogies: hornblende-plagioclase amphibolite and quartz-plagioclase granofels. The ratio of these mafic mineral compositions to felsic mineral compositions in the Ammonoosuc Volcanics is estimated

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