    Ceratosaurus /?s?r?to??s??r?s/ (from Greek κ?ρας/κ?ρατος, keras/keratos meaning "horn" and σα?ρος/sauros meaning "lizard") was a predatory theropod dinosaur in the Late Jurassic Period (Kimmeridgian to Tithonian). This genus was first described in 1884 by American paleontologist Othniel Charles Marsh based on a nearly complete skeleton discovered in Garden Park, Colorado, in rocks belonging to the Morrison Formation. The type species is Ceratosaurus nasicornis.
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