Trachodon
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Trachodon is a dubious genus of hadrosaurid dinosaur from the Upper Cretaceous of what is now Montana in the western United States. The only species is T. mirabilis, though many others have been assig
Trachodon mirabilis
Joseph Leidy, who named Trachodon
Skeletons displayed as Trachodon mirabilis at the American Museum of Natural History in 1916
"Trachodon mummy" discoered in 1908
Hadrosaurus
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Hadrosaurus is a genus of hadrosaurid ornithopod dinosaurs that lived in North America during the Late Cretaceous Period in what is now the Woodbury Formation in New Jersey about 83.6 to 77.9 million
Trachodon
…and species Thespesius occidentalis based on hadrosaurid tail vertebrae and a phalanx from the Lance Formation of South Dakota, and in 1859 he named Hadrosaurus foulkii based on a partial skeleton from the Woodbury Formation of New Jersey. By 1860, however, he began to question the relationship between these remains…
Hadrosaurus reconstruction
Photograph of the site where the fossils were found (2010)
Benjamin Waterhouse Hawkins mounted Hadrosaurus (background), the first mounted dinosaur skeleton in the world
Displayed casts of the 35 known bones at the Philadelphia Academy of Natural Sciences