Porphyritic biotite granodiorite in northern Jefferson dome in Milan quadrangle

Porphyritic biotite granodiorite in northern Jefferson dome in Milan quadrangle.
State New Hampshire
Name Porphyritic biotite granodiorite in northern Jefferson dome in Milan quadrangle
Geologic age Late Ordovician
Lithologic constituents
Major
Igneous > Plutonic > Granitic > Granodiorite (Pluton)porphyritic biotite granodiorite
Comments Part of the Oliverian Plutonic Suite (Late Ordovician) - Pink, weakly to moderately foliated, locally porphyritic biotite granitoids found in mantled gneiss domes. Mafic varieties contain hornblends. Variably metamorphosed up to amphibolite facies.
References
NGMDB product
Counties Coos