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 agoMass: 66 – 2,200 lbsLength: 15 ft.Higher classification: PachycephalosauridaeScientific 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 g