Fig. 6 in Ontogeny and variation in the skull roof and braincase of the hadrosaurid dinosaur Maiasaura peeblesorum from the Upper Cretaceous of Montana, USA

Fig. 6. Hadrosaurid dinosaur Maiasaura peeblesorum Horner and Makela, 1979, from the Two Medicine Formation (Campanian), Linster Quarry, Montana, USA (A–C) and Brachylophosaurus canadensis Sternberg, 1953, from Oldman Formation (Campanian) of Alberta, Little Sandhill Creek, Canada (D); detail of anterior margins of dorsotemporal fenestrae showing the variable development of overhanging ledges. A. ROM 66181, in oblique left posterodorsal view. B. ROM 60260, in oblique right posterodorsal view. C. ROM 66180, in posterodorsal view. D. CMN 8893, in oblique right posteroventral view, detail of overhanging ledge viewed through the right lateral temporal fenestra. Scale bars 20 mm.