Pachycephalosaurus sp. Rib Bone | Montana

Pachycephalosaurus sp. Rib Bone

Upper Cretaceous  (68 - 66 million years ago)

Private Ranch, Hell Creek Formation

Dawson County, Montana

Specimen measures approx: 12.5" x .75" x .5"

This specimen has been repaired and restored as with nearly all dinosaur bones found. 

Great specimen!

Pachycephalosaurus is a genus of pachycephalosaurid dinosaurs. It lived during the Late Cretaceous Period of what is now North America. Remains have been excavated in Montana, South Dakota, Wyoming and Alberta. 

Lived: 72.1 million years ago - 66 million years ago
Mass: 66 – 2,200 lbs
Length: 15 ft.
Higher classification: Pachycephalosauridae
Scientific name: Pachycephalosaurus (Thick-headed lizard)
Order: Ornithischian dinosaurs

Like other pachycephalosaurids, Pachycephalosaurus was a bipedal herbivore with an extremely thick skull roof. It possessed long hindlimbs and small forelimbs. Pachycephalosaurus is the largest-known pachycephalosaur. The thick skull domes of Pachycephalosaurus and related genera gave rise to the hypothesis that pachycephalosaurs used their skulls in intra-species combat. This hypothesis has been disputed in recent years.