Biotite-quartz diorite gneiss of Vernon dome

Light-gray, well-foliated subporphyritic biotite (┬▒hornblende)-quartz diorite and trondhjemite gneiss; forms sills in overlying Ammonoosuc Volcanics. Part of the Bronson Hill arch intrusive rocks.
State Vermont
Name Biotite-quartz diorite gneiss of Vernon dome
Geologic age Late Ordovician
Lithologic constituents
Major
Metamorphic > Metaigneous > OrthogneissTrondhjemite gneiss. Forms sills in overlying Ammonoosuc Volcanics.
Igneous > Plutonic > Dioritic > Quartz-diorite (Dome, Dike or sill)Light-gray, well-foliated subporphyritic biotite (┬▒hornblende)-quartz diorite. Forms sills in overlying Ammonoosuc Volcanics.
References
NGMDB product
Counties Windsor