First occurrence of Maiasaura (Dinosauria, Hadrosauridae) from the Upper Cretaceous Oldman Formation of southern Alberta, Canada

  title={First occurrence of Maiasaura (Dinosauria, Hadrosauridae) from the Upper Cretaceous Oldman Formation of southern Alberta, Canada},
  author={Bradley McFeeters and David C Evans and Michael J. Ryan and Hillary C. Maddin},
  journal={Canadian Journal of Earth Sciences},
We describe a new partial skull with braincase of a maiasaurin hadrosaurid from the Milk River Ridge Reservoir near Warner, southern Alberta, as the first diagnostic occurrence of Maiasaura in Cana... 
A new brachylophosaurin (Dinosauria: Hadrosauridae) from the Upper Cretaceous Menefee Formation of New Mexico
Onatops is the first brachylophosaurin reported from New Mexico and the southernmost occurrence of the clade, and a phylogenetic analysis places Ornatops in a trichotomy with Probrachyophosaurus and Brachylophosaurus, with Maiasaura and Acristavus as successive outgroups.
The phylogenetic nomenclature of ornithischian dinosaurs
The nomenclature of ornithischian dinosaur clades is revised; 76 preexisting ornithischerian clade names are revisited, their recent and historical use is reviewed, and their phylogenetic definitions are formally established.
Sr‐O‐C isotope signatures reveal herbivore niche‐partitioning in a Cretaceous ecosystem
Stable and radiogenic isotopes represent powerful tools for reconstructing ecological and environmental patterns in ancient ecosystems. The Cretaceous of North America preserves a diverse record of


A new hadrosaur (Reptilia, Ornithischia) from the Upper Cretaceous Judith River Formation of Montana
  • J. Horner
  • Environmental Science, Geography
  • 1988
ABSTRACT The Family Hadrosauridae as commonly understood is here considered diphyletic on the basis of a cladistic analysis, and the two previously recognized subfamilies are raised to family status.
A new ceratopsid from the Foremost Formation (middle Campanian) of Alberta
Xenoceratops foremostensis gen. et. sp. nov., a new centrosaurine ceratopsid from the Foremost Formation (Campanian) of Alberta, is described based on frill material from at least three adult-sized
A New Hadrosaurine (Dinosauria: Hadrosauridae) from the Marine Deposits of the Late Cretaceous Hakobuchi Formation, Yezo Group, Japan
The results of both Dispersal Extinction Cladogenesis and Ancestral State Reconstruction analyses imply that the marine-influenced environment in North America during the Campanian may have played an important role for the hadrosaurid diversification in its early evolutionary history.
A new saurolophine hadrosaurid (Dinosauria: Ornithopoda) from the Campanian of Utah, North America
Comparisons with phylogenetic analyses from other studies show that a current consensus exists between the general structure of the hadrosaurid evolutionary tree, but on closer examination there is little agreement among species relationships.
Perinatal specimens of Maiasaura from the Upper Cretaceous of Montana (USA): insights into the early ontogeny of saurolophine hadrosaurid dinosaurs
A more complete documentation of the morphology of these specimens, along with an examination of variation during a large span of the development of saurolophine hadrosaurids, indicates that early ontogenetic stages may still provide a limited amount of character information useful for systematics and phylogenetic inference.
A New Saurolophine Dinosaur from the Latest Cretaceous of Far Eastern Russia
The high diversity and mosaic distribution of Maastrichtian hadrosaurid faunas in the Amur-Heilongjiang region are the result of a complex palaeogeographical history and imply that many independent hadrosaurusid lineages dispersed without any problem between western America and eastern Asia at the end of the Cretaceous.
Principal characters of American Jurassic dinosaurs, Part V
IN previous articles, the writer has described the main characters of lJ:[orosaurus, Apatosaurus, J)iplodocus, and Atlantosaurus, the best known genera of the Sa~tropoda hitherto found in American
New Hadrosaurid Dinosaurs from the Uppermost Cretaceous of Northeastern China
Several hundred disarticulated dinosaur bones have been recovered from a large quarry at Wulaga (Heilongjiang Province, China), in the Upper Cretaceous (Maastrichtian) Yuliangze Formation. The Wulaga
Supplementary cranial description of the types of Edmontosaurus regalis (Ornithischia: Hadrosauridae), with comments on the phylogenetics and biogeography of Hadrosaurinae
The cranial anatomy of the flat-skulled hadrosaurine Edmontosaurus regalis (Ornithischia: Hadrosauridae) is extensively described here, based on the holotype and paratype collected from the middle
A New Brachylophosaurin Hadrosaur (Dinosauria: Ornithischia) with an Intermediate Nasal Crest from the Campanian Judith River Formation of Northcentral Montana
The small triangular posteriorly oriented nasal crest of Probrachylophosaurus is proposed to represent a transitional nasal morphology between that of a non-crested ancestor such as Acristavus and the large flat posteriorlyoriented nasal crest in adult Brachylophosaurs.