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… Expand
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References

SHOWING 1-10 OF 16 REFERENCES
The Ischigualasto Tetrapod Assemblage (Late Triassic, Argentina) and 40Ar/39Ar Dating of Dinosaur Origins
TLDR
Dating of sanidine from a bentonite interbedded in the Ischigualasto Formation of northwestern Argentina yielded a plateau age of 227.8 � 0.3 million years ago, diminishing the magnitude of the proposed late Carnian tetrapod extinction event. Expand
Ascent of Dinosaurs Linked to an Iridium Anomaly at the Triassic-Jurassic Boundary
TLDR
Analysis of tetrapod footprints and skeletal material from more than 70 localities in eastern North America shows that large theropod dinosaurs appeared less than 10,000 years after the Triassic-Jurassic boundary, marking the establishment of dinosaur-dominated communities that prevailed for the next 135 million years. Expand
A BEAKED HERBIVOROUS ARCHOSAUR WITH DINOSAUR AFFINITIES FROM THE EARLY LATE TRIASSIC OF POLAND
Abstract An accumulation of skeletons of the pre-dinosaur Silesaurus opolensis, gen. et sp. nov. is described from the Keuper (Late Triassic) claystone of Krasiejów in southern Poland. The strata areExpand
Permian tetrapods from the Sahara show climate-controlled endemism in Pangaea
TLDR
The results show that long-standing theories of Late Permian faunal homogeneity are probably oversimplified as the result of uneven latitudinal sampling, and suggest that faunas from the poorly sampled xeric belt that straddled the Equator during thePermian period differed markedly from well-sampled fauna that dominated tropical-to-temperate zones to the north and south. Expand
A critical re‐evaluation of the Late Triassic dinosaur taxa of North America
Synopsis The North American Triassic dinosaur record has been repeatedly cited as one of the most complete early dinosaur assemblages. The discovery of Silesaurus from Poland and the recognition thatExpand
Dinosaurian precursors from the Middle Triassic of Argentina: Marasuchus lilloensis, gen. nov.
TLDR
Several synapomorphies unite Marasuchus and dinosaurs (as Dinosauriformes) to the exclusion of the contemporary dinosauromorph Lagerpeton and pterosaurs. Expand
Faunal replacement in the Triassic of South America
TLDR
Improvements in the locomotor apparatus are discernible in seven groups of archosaurs and indicate that a great adaptive radiation took place before the oldest recorded fauna dominated by archosaurs appeared. Expand
THE ORIGIN AND EVOLUTION OF DINOSAURS
TLDR
The phylogenetic history of ornithischian and saurischian dinosaurs reveals evolutionary trends such as increasing body size and Adaptations to herbivory in dinosaurs were not tightly correlated with marked floral replacements. Expand
Early ornithischian dinosaurs: the Triassic record
Abstract Ornithischian dinosaurs are one of the most taxonomically diverse dinosaur clades during the Mesozoic, yet their origin and early diversification remain virtually unknown. In recent years,Expand
Dinosaurian precursors from the Middle Triassic of Argentina: Lagerpeton chanarensis
TLDR
There is no evidence that Lagerpeton and other small-bodied dinosauromorphs in the Los Chanares fauna, namely “Lagosuchus” lilloensis, comprise a monophyletic group. Expand
...
1
2
...