Fig. 13 in Ontogeny and variation in the skull roof and braincase of the hadrosaurid dinosaur Maiasaura peeblesorum from the Upper Cretaceous of Montana, USA

Fig. 13. Hadrosaurid dinosaur Maiasaura peeblesorum Horner and Makela, 1979, from the Two Medicine Formation (Campanian), Linster Quarry, Montana, USA; basicrania in ventral view. A. ROM 66182. B. ROM 60261. C. ROM 60260. D. ROM 66180. Arrows point to the contact between the basisphenoid (anterior) and basioccipital (posterior), and illustrate the variable orientation of this contact. Scale bars 20 mm.