Fig. 12 in Ontogeny and variation in the skull roof and braincase of the hadrosaurid dinosaur Maiasaura peeblesorum from the Upper Cretaceous of Montana, USA

Fig. 12. Hadrosaurid dinosaur Maiasaura peeblesorum Horner and Makela, 1979, from the Two Medicine Formation (Campanian), Linster Quarry, Montana, USA; skulls in posterior view A. ROM 60261. B. ROM 66180. ROM 66180 is photographed in a slightly more posterodorsal perspective than ROM 60261; in actuality, the basipterygoid processes of both specimens project ventral to the occipital condyle.