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Evans, David C., Bavington, Rebecca, Campione, Nicolás E. (2009) An unusual hadrosaurid braincase from the Dinosaur Park Formation and the biostratigraphy of Parasaurolophus (Ornithischia: Lambeosaurinae) from southern Alberta. Canadian Journal of Earth Sciences, 46 (11) 791-800 doi:10.1139/e09-050

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Reference TypeJournal (article/letter/editorial)
TitleAn unusual hadrosaurid braincase from the Dinosaur Park Formation and the biostratigraphy of Parasaurolophus (Ornithischia: Lambeosaurinae) from southern Alberta
JournalCanadian Journal of Earth Sciences
AuthorsEvans, David C.Author
Bavington, RebeccaAuthor
Campione, Nicolás E.Author
Year2009 (November)Volume46
Issue11
PublisherCanadian Science Publishing
DOIdoi:10.1139/e09-050Search in ResearchGate
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Mindat Ref. ID484472Long-form Identifiermindat:1:5:484472:7
GUID0
Full ReferenceEvans, David C., Bavington, Rebecca, Campione, Nicolás E. (2009) An unusual hadrosaurid braincase from the Dinosaur Park Formation and the biostratigraphy of Parasaurolophus (Ornithischia: Lambeosaurinae) from southern Alberta. Canadian Journal of Earth Sciences, 46 (11) 791-800 doi:10.1139/e09-050
Plain TextEvans, David C., Bavington, Rebecca, Campione, Nicolás E. (2009) An unusual hadrosaurid braincase from the Dinosaur Park Formation and the biostratigraphy of Parasaurolophus (Ornithischia: Lambeosaurinae) from southern Alberta. Canadian Journal of Earth Sciences, 46 (11) 791-800 doi:10.1139/e09-050
In(2009, November) Canadian Journal of Earth Sciences Vol. 46 (11) Canadian Science Publishing
Abstract/Notes The lambeosaurine hadrosaurid Parasaurolophus is known from rare occurrences in Campanian deposits of western North America. A previously undescribed large hadrosaurid braincase from the Dinosaur Park Formation (Alberta, Canada) is assigned to the genus Parasaurolophus on the basis of several derived characters associated with the frontal–nasal articulation at the base of the crest. This identification is supported by two separate phylogenetic analyses, in which the specimen clusters with other more completely known Parasaurolophus exemplars. If correctly identified, the specimen represents the third and largest cranial specimen of the genus from the Late Cretaceous of Alberta. The specimen occurs in the same deposits as the holotype specimen of Parasaurolophus walkeri and may represent a late ontogenetic stage of this taxon. As opposed to a small frontal dome in the holotype of P. walkeri , the external contribution of the frontal to the skull roof is obliterated in the new specimen. If these hypothesized ontogenetic changes in the skull roof correlate with the size and posterodorsal development of the crest, as in other lambeosaurines, it suggests that the crest had not reached its full expression in the holotype. When placed into a detailed biostratigraphic context for the first time, the limited Parasaurolophus material from the Belly River Group is distributed in the lower half of the Dinosaur Park Formation at Dinosaur Provincial Park. This suggests that Parasaurolophus may be associated with the lower Centrosaurus – Corythosaurus assemblage zone and may have preferred more inland environments than other hadrosaurids, such as Lambeosaurus and Prosaurolophus .


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