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 medium sized herbivorous bipedal dinosaur from the latest Cretaceous North America, notably including the Hell Creek Formation. Pachycephalosaurus is a genus that has had much controversy taxonomically. The two contemporaneous genera stygimoloch and dracorex have undergone much scrutiny to determine whether they are valid species or if they are actually juvenile growth stages of Pachycephalosaurus. Most current consensus suggests that they are, making Pachycephalosaurus the predominant Pachycephalosaur of the Hell Creek Formation.

  • 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.

  • An artists reconstruction of Pachycephalosaurus.  By Jordan Mallon
    An artists reconstruction of Pachycephalosaurus. By Jordan Mallon

    Carter County County, Montana
    Hell Creek Formation
    2.6 x 1.5 x .9"
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