Hardwick Tonalite

Dark-gray, moderately to strongly foliated biotite tonalite to granodiorite gneiss; intrudes Dl.
State Massachusetts
Name Hardwick Tonalite
Geologic age Lower Devonian
Lithologic constituents
Major
Metamorphic > GneissDark-gray, moderately to strongly foliated biotite tonalite to granodiorite gneiss
Comments Part of Merrimack Belt (Silurian, Devonian and Pennsylvanian Rocks)
References
NGMDB product
Counties Hampden - Hampshire - Worcester