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Monadnock Mountain pluton - quartz syenite (VTJmsy;0)
Geologic Formation
near
Colebrook
in
NH
,
VT
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Geologic Age
Toarcian – Bajocian (179 Ma – 171 Ma ago)
Geologic Unit Label
Jmsy
Greenish-gray to pink hornblende-biotite quartz syenite. Monadnock Mountain pluton: Composite stock of quartz syenite, syenite granite, and essexite. K-Ar age of 175±4 Ma (Foland and Faul, 1977). Part of the White Mountain Igneous Suite.
—
USGS
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Geologic Formation
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