 Ceratopsia appears to have originated in Asia , as all of the earliest members are found there . <unk> remains , including teeth , which appear to be neoceratopsian , are found in North America from the <unk> stage ( 112 to 100 million years ago ) , indicating that the group had dispersed across what is now the Bering Strait by the middle of the Cretaceous Period . Almost all <unk> are North American , aside from <unk> , which may represent a separate dispersal event , back into Asia . <unk> and their immediate ancestors , such as Zuniceratops , were unknown outside of western North America , and were presumed endemic to that continent . The traditional view that <unk> originated in North America was called into question by the 2009 discovery of better specimens of the dubious Asian form Turanoceratops , which confirmed it as a ceratopsid . It is unknown whether this indicates ceratopsids actually originated in Asia , or if the Turanoceratops immigrated from North America . 
