Horned dinosaur A new species of horned dinosaur, "Machairoceratops cronusi", thought to have lived about 77 million years ago, is discovered in southern Utah. A New Centrosaurine Ceratopsid, Machairoceratops cronusi gen et sp. nov., from the Upper Sand Member of the Wahweap Formation (Middle Campanian), Southern Utah © PLOS One Sources: FOX News Huffington Post PLOS One