Barnum Brown
Saurolophus (; meaning "lizard crest") is a genus of large hadrosaurid dinosaur from the Late Cretaceous period of Asia and North America, that lived in what is now the Horseshoe Canyon and Nemegt formations about 70 million to 68 million years ago. It is one of the few genera of dinosaurs known from multiple continents. The type species, "S. osborni", was described by Barnum Brown in 1912 from Canadian fossils. A second valid species, "S. angustirostris", is represented by numerous specimens from Mongolia, and was described by Anatoly Konstantinovich Rozhdestvensky.