Pachycephalosaur (dome-headed dinosaur)
~ 10 – 15 feet
~ 1,000 pounds
Montana, Wyoming, South Dakota
Late Cretaceous Period
The skull of Pachycephalosaurus underwent radical changes as it grew up. Young animals had a flat head with large spikes, but as Pachycephalosaurus matured the spikes reduced in size and it grew a large cranial dome. Pachycephalosaurus is often portrayed as using its dome as a battering ram, but the spikes and dome may have instead been used for visual display.
Displayed along the Montana Dinosaur Trail:
Museum of the Rockies, Carter County Museum, Garfield County Museum, Frontier Gateway Museum