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The Ischigualasto Tetrapod Assemblage (Late Triassic, Argentina) and 40Ar/39Ar Dating of Dinosaur Origins
40Ar/39Ar 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. This middle Carnian age is aExpand
THE OSTEOLOGY OF MASIAKASAURUS KNOPFLERI, A SMALL ABELISAUROID (DINOSAURIA: THEROPODA) FROM THE LATE CRETACEOUS OF MADAGASCAR
Abstract We describe the osteology of the new small theropod dinosaur Masiakasaurus knopfleri, from the Late Cretaceous Maevarano Formation of northwestern Madagascar. Approximately 40% of theExpand
Primitive dinosaur skeleton from Argentina and the early evolution of Dinosauria
WE report here the discovery of a primitive dinosaur skeleton from Upper Triassic strata in northwestern Argentina. The 1-m-long skeleton represents a new taxon, Eoraptor lunensis gen. et sp. nov.,Expand
The last of the dinosaur titans: a new sauropod from Madagascar
The Titanosauria, the last surviving group of the giant sauropod dinosaurs, attained a near-global distribution by the close of the Cretaceous period (65 Myr ago). With the exception of a few newExpand
A basal ceratopsian with transitional features from the Late Jurassic of northwestern China
Although the Ceratopsia and Pachycephalosauria, two major ornithischian groups, are united as the Marginocephalia, few synapomorphies have been identified due to their highly specialized body-plans.Expand
New Horned Dinosaurs from Utah Provide Evidence for Intracontinental Dinosaur Endemism
Background During much of the Late Cretaceous, a shallow, epeiric sea divided North America into eastern and western landmasses. The western landmass, known as Laramidia, although diminutive in size,Expand
A Jurassic ceratosaur from China helps clarify avian digital homologies
Theropods have traditionally been assumed to have lost manual digits from the lateral side inward, which differs from the bilateral reduction pattern seen in other tetrapod groups. This unusualExpand
THE SKULL OF RAPETOSAURUS KRAUSEI (SAUROPODA: TITANOSAURIA) FROM THE LATE CRETACEOUS OF MADAGASCAR
Abstract Rapetosaurus krausei (Sauropoda: Titanosauria) from the Upper Cretaceous Maevarano Formation of Madagascar is the best-preserved and most complete titanosaur yet described. The skull ofExpand
The postcranial skeleton of the ornithopod dinosaur Tenontosaurus tilletti
ABSTRACT Tenontosaurus tilletti is a moderate-sized ornithopod dinosaur from the Lower Cretaceous (Aptian–Albian) Cloverly Formation in Montana and Wyoming. Tenontosaurus remains are abundant. TheExpand
A basal tyrannosauroid dinosaur from the Late Jurassic of China
The tyrannosauroid fossil record is mainly restricted to Cretaceous sediments of Laurasia, although some very fragmentary Jurassic specimens have been referred to this group. Here we report a newExpand
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