Moretown Formation

Nubble garnet schist, pinstriped granofels, and fine-grained amphibolite in equal parts.
State Massachusetts
Name Moretown Formation
Geologic age Middle Ordovician or older
Lithologic constituents
Major
Metamorphic > Schistnubble garnet schist
Metamorphic > Granoblastic > Granofelspinstriped granofels
Metamorphic > Amphibolitefine-grained amphibolite
Comments Part of Rowe-Hawley Zone (Ordovician and Older Rocks). Early Ordovician age from zircons (479+/-8 Ma) constrains the age of the previously undated Moretown Formation to Early Ordovician or older. Moretown had been interpreted as Middle Ordovician based on correlations with the Beauceville Formation of southern Quebec and the Missisquoi Formation of VT (Karabinos and Williamson, 1994) per MA005.
References
NGMDB product
Counties Franklin - Hampden - Hampshire