Trenton Prong

The Trenton Prong stretches from near Norristown, Pennsylvania, through northern Philadelphia and southern Bucks County, reaching its northern terminus in West Windsor Township, New Jersey.^[1] The prong underlies much of the City of Trenton, and forms a series of rapids known as the Falls of the Delaware River.

The Trenton Prong is part of the Precambrian basement which is discontinuously exposed in the north-central Appalachians. The rocks that make up the prong are mostly Ediacaran and Cambrian aged rocks, that includes the Wissahickon Formation.^[2] Other rocks present include metabasalt, gabbro, gneiss, migmatite and granofels. The prong is heavily eroded, presenting as low, gently rolling hills.^[3]