Pachycephalosaurus Dome Fragment Size:Small Above: Artist's reconstruction of Chicxulub

Above: Artist's reconstruction of Chicxulub crater soon after impact

Above: Challenger hitches a ride on NASA's Boeing 747 Shuttle Carrier Aircraft (SCA)

There are two sizes available

959 passengers aboard

Above: Sample Hyracodon Teeth

Pachycephalosaurus Dome Fragment Size:Small Above: Artist's reconstruction of ChicxulubPachycephalosaurus was a Late Cretaceous dinosaur with a unique feature: its skull had a battering ram like bone plate. This several inch thick helmet of bone allowed it to absorb blunt force when it struck its head against surfaces. This specimen is a piece of a Pachycephalosaurus skull dome fossil recovered from the Hell Creek formation in South Dakota. It's estimated to be over 66,000,000 years old. Both small and medium sized fragments are