Hornblende gabbro-diorite

Biotite-hornblende (±pyroxene) gabbro and diorite at Robinson Hill in Shrewsbury; exhibits fine-grained chill contact that crosscuts paragneiss units. Unit also in Lincoln Mountain massif and at Brandon Gap; similar rock mapped in the Adirondacks. Chittenden Intrusive Suite (1,149±8 Ma to 1,119±3 Ma). Mount Holly Complex intrusive rocks. Rocks of the Green Mountain and Lincoln Mountain massifs and eastern domes.
State Vermont
Name Hornblende gabbro-diorite
Geologic age Mesoproterozoic
Lithologic constituents
Igneous > Plutonic > Gabbroic > GabbroBiotite-hornblende (±pyroxene) gabbro and diorite.
Igneous > Plutonic > Dioritic > DioriteBiotite-hornblende (±pyroxene) gabbro and diorite.
NGMDB product
Counties Addison - Rutland - Windsor