A Late Triassic Dinosauromorph Assemblage from New Mexico and the Rise of Dinosaurs

@article{Irmis2007ALT,
  title={A Late Triassic Dinosauromorph Assemblage from New Mexico and the Rise of Dinosaurs},
  author={Randall B. Irmis and Sterling J. Nesbitt and Kevin Padian and Nathan D Smith and Alan H. Turner and D D Woody and Alex Downs},
  journal={Science},
  year={2007},
  volume={317},
  pages={358 - 361}
}
It has generally been thought that the first dinosaurs quickly replaced more archaic Late Triassic faunas, either by outcompeting them or when the more archaic faunas suddenly became extinct. Fossils from the Hayden Quarry, in the Upper Triassic Chinle Formation of New Mexico, and an analysis of other regional Upper Triassic assemblages instead imply that the transition was gradual. Some dinosaur relatives preserved in this Chinle assemblage belong to groups previously known only from the… 
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