Beautiful tooth of a mature Pachycephalosaurus. This dinosaur, best known for its bony skull most probably used as defence, went extinct at the end of the Cretaceous during the mass extinction event of all dinosaurs.
Species: Pachycephalosaurus wyomingensis
Age: Late Cretaceous (70 -66 mil.-y)
Dimensions: 8 mm - 3/8"
Origin: Hell Creek Formation, Jordan, Montana, USA