A the University of Calgary 's paleontologist shows off a Pachyrhinosaurus skull . It 's one of the biggest , if not the biggest , of its kind at 5 tons , she says . The discovery is also remarkably intact , though there 's still more to reveal . This Pachyrhinosaurus can go to the head of its class . Pachyrhinosaurs lived about 70 million years ago in Alaska 's Calgary and Alberta .
A the University of Calgary 's paleontologist shows off a Pachyrhinosaurus skull . It 's one of the biggest , if not the biggest , of its kind at 5 tons , she says . The discovery is also remarkably intact , though there 's still more to reveal . Pachyrhinosaurs lived about 70 million years ago in Alaska 's Calgary and Alberta .