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This timeline of ceratopsian research is a chronological listing of events in the history of paleontology focused on the ceratopsians, a group of herbivorous marginocephalian dinosaurs that evolved parrot-like beaks, bony frills, and, later, spectacular horns. The first scientifically documented ceratopsian fossils were described by Edward Drinker Cope starting in the ; however, the remains were poorly preserved and their true nature was not recognized. Over the next several decades, Cope named several such genera and species. Cope's hated rival, Othniel Charles Marsh, also described ceratopsian remains. In 1887, Marsh mistook a "Triceratops" horn for one belonging to a new species of prehistoric "Bison". Marsh also named the eponymous genus "Ceratops" in 1888. The next year, he named the most famous ceratopsian, "Triceratops horridus". It was the discovery of "Triceratops" that illuminated the ceratopsian body plan, and he formally named the Ceratopsia in 1890.
1887