The smallest ceratopsid skull–Judith River Formation of Alberta
A partial skull found at Dinosaur Provincial Park, Alberta, in Upper Cretaceous (Campanian) sediments is the smallest specimen of a ceratopsid ever found, belonging to an animal about 1.1 m long. It represents an animal probably less than 2 years old, one fifth of its adult size. The shape of the squamosal and the thinness of the parietal suggest a tentative referral to Monoclonius. Strong positive allometric growth of the parietal fenestra is inferred.