The seal of Iguanodon

Although the teeth of Iguanodon were discovered in 1822, more definitive skeletal remains of the dinosaur did not appear until 1834, which were discovered in Maidstone, Kent in England. These remains, as well as others from the same locality and elsewhere, allowed for skeletal reconstructions to be made of this animal, although the similarity of the teeth of Iguanodon to a living iguana seemed to dominate artistic depictions until the famous Belgium fossils were discovered. Over a hundred years later, the town of Maidstone added the Iguanodon as a supporter (a figure holding up the center piece) on their coat of arms in commemoration of the find.

While the coat of arms that appears on the New Jersey state flag features the "goddess of liberty" and "goddess of agriculture" rather than archosaurs, it does have a state dinosaur: Hadrosaurus foulkii. In 1991 the state adopted Hadrosaurus foulkii as the official state dinosaur as it was discovered in marl in southern New Jersey in 1858 by William Parker Foulke, the reasonably complete skeleton showing that larger dinosaurs were upright bipeds rather than "reptilian pachyderms."

Last fall I visited Haddonfield, NJ to see the site where Hadrosaurus was discovered, but all that I found was a small plaque at the end of a suburban cul de sac (with a new house going up just across the street). Whatever other fossils might be in the ground, they're now overlain by suburban sprawl, a bit of a shame for such a historic locality.

References;

Swinton, W.E. (1951) "Gideon Mantell and the Maidstone Iguanodon." Notes and Records of the Royal Society of London, Vol. 8 (2), pp. 261-276.