More complete fossils have been found in recent years. It was a herbivorous creature which is primarily known from a single skull and a few extremely thick skull roofs, at 9 inches thick. Remains have been excavated in Montana, South Dakota, Wyoming and Alberta. It lived during the Late Cretaceous Period ( Maastrichtian stage) of what is now North America. Pachycephalosaurus ( / ˌ p æ k ɪ ˌ s ɛ f əl ə ˈ s ɔː r ə s/ meaning "thick-headed lizard", from Greek pachys-/ παχύς- "thick", kephale/ κεφαλή "head" and sauros/ σαῦρος "lizard") is a genus of pachycephalosaurid dinosaurs.
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