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Late Cretaceous / Cretaceous / Mesozoic / Chasmosaurines / Pachycephalosaurs / Tyrannosaurus / Tyrannosaurids / Triceratops / Edmontosaurus annectens / Edmontosaurus / Thescelosaurus / Pachycephalosaurus


Dinosaur Census Reveals Abundant Tyrannosaurus and Rare Ontogenetic Stages in the Upper Cretaceous Hell Creek Formation (Maastrichtian), Montana, USA John R. Horner1*, Mark B. Goodwin2, Nathan Myhrvold3 1 Museum of the R
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