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Saurolophus is a large hadrosaurid that lived in Asia and North America during Late Cretaceous (Campanian) times, about 74 to 70 million years ago. Like many hadrosaurs, Saurolophus has a distinctive crest, which in its case slopes upward from the back of the skull. The holotype skeleton (displayed in the AMNH) measures 8.4 meters long. The type species is known from the Horseshoe Canyon Formation in Alberta, Canada. There is also a Mongolian species (S. angustirostris) known from the Nemegt Formation. It is represented by more fossils than any other Mongolian hadrosaurid, and appears to have been the dominant herbivore. Other dinosaurs that coexisted with Saurolophus included the horned ceratopsians, the armored ankylosaurs, and the meat-eating tyrannosaurs, all of which lived in either of the continents in which this animal existed.
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