This puddingstone is a distinctive, Late Devonian, grayish-purple to grayish-red, thin to very thick-bedded, cross–bedded, conglomerate.
The Schunemunk puddingstone, which is exposed extensively on Bearfort Mountain, Boonton, Rockaway Township and Schunemunk Mountain, is a conglomerate in New York and New Jersey that is part of a  thick geologic formation formally known as the Skunnemunk Conglomerate.