Claim: Saurolophus is a large hadrosaurid dinosaur from the Late Cretaceous, a group known for the flat duck bill appearance of the bones in their snout.
Evidence: Saurolophus (/sɔːˈrɒləfəs/; 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. This group is known as the duck-billed dinosaurs for the flat duck-bill appearance of the bones in their snouts.