Biotite tonalite

Dark-gray; found in southeastern and western New Hampshire.
State New Hampshire
Name Biotite tonalite
Geologic age Early - Late Devonian
Lithologic constituents
Igneous > Plutonic > Granitic > Tonalite (Pluton)biotite tonalite - dark-gray
Comments Part of the New Hampshire Plutonic Suite (Late to Early Devonian) - Includes synkinematic and postkinematic granitoids related to the Acadian orogeny. Ages range from 410 to 365 Ma.
NGMDB product
Counties Grafton - Merrimack - Strafford