Fossilized Caudal (Tail) Fin of Marine Animal

Unusual fossil of caudal (tail) fin of a marine animal. Take note of vetebral epiphysis (growth plate on end of spine) showing this was a juvenile. Found in the Mid-Atlantic coastal region of the U.S. Age: 10,000 to 25 million years old. Species unknown. Overall measurement is 1.75 inches wide by 3.0 inches long by 1.0 inches thick.