This photo shows garnets within the Waits River Formation. Garnets are by no means unusual in Massachusetts: regional metamorphism associated with repeated episodes of Appalachian mountain building (called "orogenies") has produced garnets all over the place-- In New England, they predominantly grew in place during such events during metamorphism.
Looking north along the Connecticut River towards the Holyoke Range at Dinosaur Footprint State Reservation in Holyoke. Lacustrine beds at the base of the lower Jurassic East Berlin formation crop out in the river.
The MA Geological Survey
Department of Geosciences
269 Morrill Science Center
University of Massachusetts
611 North Pleasant Street
Amherst, MA 01003-9297