Much of what is going under as the sea advances is material that was deposited as previous ice sheets melted. The Cape May Formation, the major geologic formation along the bay, was deposited during previous interglacial periods as rivers ran to the sea. Much of the Cape May Delta was created by a larger ancestral Great Egg Harbor River. Melting ice created land that now is threatened by higher seas… Underneath Sandy Hook, we found 270 feet of sediments deposited since 20,000 years ago," said Kenneth Miller, a marine geologist at Rutgers University.
/ / / A Brief History of the Delaware Bay