The Hadrosaurus, a duckbilled dinosaur, probably lived along the bays of New Jersey's seacoast in the Cretaceous Period, about 80 million years ago. The Hadrosaurus was twenty-five feet in length, 10 feet tall, and weighed between 7 and 8 tons. The blunt teeth show that Hadrosaurus was a vegetarian, with the ability to graze on stems, twigs and leaves. Hadrosaurus remains are found in a matrix of prehistoric marine deposits and fossilized seashells.