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Saurolophus is a large hadrosaurid. Like many hadrosaurs, Saurolophus has a distinctive crest, which in its case slopes upward from the back of the skull. The holotye skeleton (displayed in the AMNH) measures 8.4 meters long. The type species is known from the Horsehoe 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.
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