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Hadrosaurus foulkii

New Jersey State Dinosaur

Hadrosaur fossil skull; photo by e_monk on Flickr (noncommercial use permitted with attribution / share alike).

Official State Dinosaur of New Jersey

New Jersey designated Hadrosaurus foulkii as the official state dinosaur in 1991. Hadrosaurus foulkii was a duck-billed dinosaur that roamed the forests and swamps along the bays of New Jersey's prehistoric seacoast. Another hadrosaur fossil (Augustynolophus morrisi) was recognized as the state dinosaur of California in 2017. All State Dinosaurs

From New Jersey's official website; "In the summer of 1858, Victorian gentleman and fossil hobbyist William Parker Foulke was vacationing in Haddonfield, New Jersey, when he heard that twenty years previous, workers had found gigantic bones in a local marl pit. Foulke spent the the late summer and fall directing a crew of hired diggers shin-deep in gray slime. Eventually he found the bones of an animal larger than an elephant with structural features of both a lizard and a bird."