Massabesic Gneiss Complex

Biotite-feldspar paragneiss of Proterozoic Z age intruded by potassium-feldspar-rich gneiss of Ordovician age.
State Massachusetts
Name Massabesic Gneiss Complex
Geologic age Ordovician and Proterozoic Z
Lithologic constituents
Major
Metamorphic > Gneiss > Biotite-gneissBiotite-feldspar paragneiss of Proterozoic Z age intruded by potassium-feldspar-rich gneiss of Ordovician age.
Comments Part of Nashoba Zone (Silurian and Older Rocks)
References
NGMDB product
Counties Middlesex