Cambrian Cheshire quartzite on Pine Cobble, Williamstown, Massachusetts. Metamorphosed Cambro-Ordovician volcaniclastic sediments on the east side of the Berkshires.
Abundant quartz veins and glacial striations.
Intrusion breccias and other intrusive features in the roots of the Taconic island arc, Shelburn Falls, Massachusetts. Silurian Clough quartzite, Crag Mountain, just west of the Connecticut River valley. Looking southwest from the top of Roaring Brook falls, Giant Mountain, Adirondacks. Crossing Roaring Brook on the way to some outcrops, Giant Mountain, Adirondacks. Exposures of the Roaring Brook intrusion breccia, Giant Mountain, Adirondacks.