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In fact, it’s just a single bone – a postorbital, or a bone that makes up the rear border of the eye and has some of the bumpy ornamentation that made tyrannosaurs so striking.

Following the old rules, an expert would likely categorize the postorbital horn cores as those of a chasmosaurine.

“The  two postorbitals described here represent some of the earliest ceratopsid remains,” Brown writes, “and indicate a form with clearly massive, dorsolaterally projecting, straight postorbital horncores.”

Postorbital openings like otic notches are absent.

The postorbital bones are peculiar in shape and mean that the eye sockets are directed upwards and forwards.