Reexamination of a skull referred to the Late Cretaceous thick-headed ceratopsian dinosaur Pachyrhinosaurus sp. cf. P. canadensis Sternberg, from the Edmonton Formation near Drumheller, [Alberta] Canada, shows the squamosal area of the frill to have been formed in the usual short-faced ceratopsid fashion. This revision of an earlier contrary interpretation removes the major obstacle to assigning the Drumheller specimen to P. canadensis, and reinforces earlier suggestions that Pachyrhinosaurus is best classed with the short-faced members of Ceratopsidae.

You do not currently have access to this article.