This Specimen has been sold.
2.6" Pachycephalosaur Ungual (Claw) - Montana
This is a very nice, 2.6", Pachycephalosaur ungual (claw) bone, from the Hell Creek Formation of Carter County, Montana. The bone is in very good condition and is the right foot.
Pachycephalosaurus was a bipedal dinosaur that lived during the Late Cretaceous period and probably was about 15 feet in length.
Pachycephalosaurus had a distinctive, large, bony, dome on top of it's skull up to 10 inches thick to cushion it's brain from impacts.
Some paleontologists believe this thick skull may have been used for head-butting, much like rams while others contend it may have been a sexual display.
It was one of the last non-avian dinosaurs before the K-T extinction event, 65 million years ago.
There is only one known species of Pachycephalosaurus, Pachycephalosaurus wyomingensis. It's remains have been found in Montana, South Dakota and Wyoming.
It was either a herbivore or an omnivore with small leaf shaped teeth which would have been very effective at shredding plants.