fossils.

Evolution

Scott D. Sampson has compared the evolution of ceratopsids to that of some mammal groups: both were rapid from a geological perspective and precipitated the simultaneous evolution of large body size, derived feeding structures, and "varied hornlike organs." The earliest ceratopsids, including members of both Centrosaurinae and Chasmosaurinae are known from the early Campanian stage, though the fossil record for early ceratopsids is poor. All but one of the named species of

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