Pachycephalosaurus Dome Fragment Size:Small tool-making hominin Homo erectus

tool-making hominin Homo erectus

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

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959 passengers aboard

Above: Sample Hyracodon Teeth

Pachycephalosaurus Dome Fragment Size:Small tool-making hominin Homo erectusPachycephalosaurus 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