Dinosaurs discovered in western USA
A scene from Upper Cretacous western United States showing the following dinosaurs from left: Pachycephalosaurus, Ornithomimus, Triceratops and Tyrannosaurus rex
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Archosaur Archosauria Archosauriformes Archosauromorpha Bipedal Cerapoda Ceratopia Ceratopian Ceratopid Ceratopidae Ceratopsia Ceratopsian Ceratopsid Ceratopsidae Chasmosaurinae Coelurosaur Coelurosauria Diapsid Diapsida Dinosauria Dinosauromorpha Genasauria Herbivorous Maniraptoriformes Marginocephalia Marginocephalian Mimic Neoceratopia Neoceratopsia Ornithischia Ornithischian Ornithomimid Ornithomimidae Ornithomimosauria Ornithomimosaurus Ornithomimus Pachycephalosaur Pachycephalosaurid Pachycephalosaurus Phanerozoic Reptiles Reptilia Saurischian Tetanurae Theropoda Triceratops Triceratopsini Tyrannosaur Tyrannosaurid Tyrannosauridae Tyrannosaurinae Tyrannosauroidea Tyrannosaurus U.s.a
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