Schist samples commonly display garnet crystals. Quartz pebbles were ultimately derived from igneous and metamorphic terranes throughout the Appalachian region. Gravel consisting dominantly of quartz pebbles is abundant in coastal plain sediments and in Paleozoic conglomerates in the Catskills region. Quartz pebbles are extremely durable on the surface environment and can survive transport over great distances and for long periods of time. Peat is abundant in areas where nearshore subaerial erosion has exposed older tidal flat and swamp deposits.
Some samples contain shell fossils.
This example from Westhampton Beach, NY shows boring by clams. Some samples display crystals of amphibole, pyroxene, and olivene. Chert derived from Paleozoic limestones and other sources throughout the region. Check chert carefully. Chert, slate, and argillite were used by indians for an assortment of tools and weapons.