5.4" Pachycephalosaurus Caudal Vertebra With Process - Montana

This is a 5.4" tall caudal (tail) vertebra of a Pachycephalosaurus ("thick headed lizard") from the Hell Creek Formation, Glendive, Montana. This vertebrae is well preserved with its processes more or less intact. There are a number of crack repairs with some gap fill restoration but most of the processes are original bone.

  • 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

    Glendive, Montana
    Hell Creek Formation
    5.4" tall
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