Skip to main content

Moretown Formation

Moretown Formation - Light-greenish-gray to buff, fine-grained, pinstriped granofels and schist.
State Massachusetts
Name Moretown Formation
Geologic age Middle Ordovician or older
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.
Primary rock type granofels
Secondary rock type schist
Other rock types
Lithologic constituents
Major
Metamorphic > Schist
Metamorphic > Granoblastic > Granofels
Map references
Unpublished Digital Geologic Map of Massachusetts received from Rudi Hon at Boston College in 1998.
Unit references
Zen, E-An (ed.), Goldsmith, R. (comp.), Ratcliffe, N.M. (comp.), Robinson, P. (comp.), Stanley, R.S. (comp.), Hatch, N.L., Jr., Shride, A.F., Weed, E.G.A., Wones, D.R., 1983, Bedrock Geologic Map of Massachusetts: U.S. Geological Survey, Reston, VA, scale 1: 250,000.
Karabinos, Paul and Williamson, B.F., 1994, Constraints on the timing of Taconian and Acadian deformation in western Massachusetts: Northeastern Geology, v. 16, no. 1, p. 1-8.
Counties Berkshire - Franklin - Hampden