منابع مشابه
A new herrerasaurid (Dinosauria, Saurischia) from the Upper Triassic Ischigualasto Formation of northwestern Argentina
Herrerasauridae comprises a basal clade of dinosaurs best known from the Upper Triassic of Argentina and Brazil, which have yielded remains of Herrerasaurus ischigualastensis and Staurikosaurus pricei, respectively. Systematic opinion regarding the position of Herrerasauridae at the base of Dinosauria has varied. Here we describe a new herrerasaurid, Sanjuansaurus gordilloi gen. n., sp. n., bas...
متن کاملA Basal Sauropodomorph (Dinosauria: Saurischia) from the Ischigualasto Formation (Triassic, Carnian) and the Early Evolution of Sauropodomorpha
BACKGROUND The earliest dinosaurs are from the early Late Triassic (Carnian) of South America. By the Carnian the main clades Saurischia and Ornithischia were already established, and the presence of the most primitive known sauropodomorph Saturnalia suggests also that Saurischia had already diverged into Theropoda and Sauropodomorpha. Knowledge of Carnian sauropodomorphs has been restricted to...
متن کاملPreliminary Description of Coelophysoids ( Dinosauria : Theropoda ) from the Upper Triassic ( Revueltian : Early - mid Norian ) Snyder Quarry , North - Central New Mexico
The Upper Triassic Snyder quarry is the second-most productive theropod locality in the Chinle Group. Skull and postcranial elements, particularly tibiae, collected from the Snyder quarry during the last three field seasons demonstrate the presence of at least four individuals of two taxa. The smaller theropod strongly resembles, but is distinct from, the holotype of Eucoelophysis baldwini Sull...
متن کاملThe Triassic
The Triassic, lasting from 252 to 201 million years (Myr) ago, was crucial in the origin of modern ecosystems. It is the seventh of the 11 geological systems or periods into which the Phanerozoic, the fossiliferous last 540 million years, of Earth history is divided. It might seem strange to select just one of these divisions of time as somehow more significant than the others. However, this wa...
متن کاملA Time-Series Model of Dinosauria Diversity
It is widely held that the dinosaurs were driven to near extinction because of the Chicxulub asteroid collision with the Earth about 65 million years ago (MA). Without doubt, dinosaur diversity in the fossil record after the collision was at most a percent of what it was prior to the collision. But whether the collision was the principal cause of the extinction is more difficult to assess. Here...
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ژورنال
عنوان ژورنال: Nature
سال: 1869
ISSN: 0028-0836,1476-4687
DOI: 10.1038/001023a0