![Late Cretaceous / Cretaceous / Mesozoic / Chasmosaurines / Pachycephalosaurs / Tyrannosaurus / Tyrannosaurids / Triceratops / Edmontosaurus annectens / Edmontosaurus / Thescelosaurus / Pachycephalosaurus Late Cretaceous / Cretaceous / Mesozoic / Chasmosaurines / Pachycephalosaurs / Tyrannosaurus / Tyrannosaurids / Triceratops / Edmontosaurus annectens / Edmontosaurus / Thescelosaurus / Pachycephalosaurus](https://www.pdfsearch.io/img/ec18b9fbb269e05f300e11111b3102b8.jpg) 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 RAdd to Reading ListSource URL: www.ncbi.nlm.nih.govDownload Document from Source Website File Size: 515,25 KBShare Document on Facebook
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