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Prosaurolophus

Prosaurolophus (meaning “Prior Crested Lizard”) is a genus of saurolophinae dinosaur from the Late Cretaceous of the US and Canada. The type species, P. maximus, was described in 1916 by Barnum Brown, the discoverer of Tyrannosaurus rex. A second species, P. blackfeetensis, was described in 1992 by Jack Horner. Jack Horner differentiated P. blackfeetensis from P. maximus because of  the crest size. About 25 individuals have been unearthered from Dinosaur Park in Alberta and the Two Medicine Formation in Montana. The type specimen was found in 1915 near the Red Deer River in Alberta by Barnum Brown. It was a skull taken for the American Museum of Natural History. The skull can be 3 feet (0.9 metres) long. The full body length including the skull is 28 feet (8.5 metres) long.

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