The Hadrosaurus foulkii was, in fact, the first nearly complete dinosaur fossil to be found in the world. And, it was found in Haddonfield! In 1858, an amateur fossil hunter named William Parker Foulke was vacationing in Haddonfield and heard that workers had found giant bones in a pit of calcium carbonite type clay called marl nearby. The marl was used by local farmers as fertilizer. Foulke spent several months supervising the excavation of the pit before he and his workers found the giant bones.
The finding of a nearly complete set of bones to one of these giant creatures set the scientific world on its ear. Theories about dinosaurs had existed for years but nothing was ever found that provided definitive proof that they really existed. That was until Mr. Foulke found his dinosaur in Haddonfield.