Pinterest • The world’s catalog of ideas

Explore Rv Yellowstone, Yellowstone Country, and more!

A Modern Day Dinosaur Extinction. During the Cretaceous, dome-headed pachycephalosaurs roamed through what is now the Hell Creek Formation, covering parts of Montana, Wyoming, and North and South Dakota. But UCMP Curator Mark Goodwin and Museum of the Rockies Curator Jack Horner argue that there were fewer pachycephalosaur species than we thought. Subjects: Paleontology, dinosaurs. Length: 6:38