I found the geological explanation in this link very interesting. He does a great service to New Jersey citizens by his interesting and knowledgeable interpretations.
Big Brook - New Jersey's Classic Late Cretaceous, Fossil-Collecting Locality
"At first it may seem to be a piddly little dribble through the farmlands and forests of rural New Jersey, but careful observation shows...
written-in-stone-seen-through-my-lens.blogspot.com