The oldest unequivocal records of Dinosauria were unearthed from Late Triassic rocks
(approximately 230 Ma) accumulated over extensional rift basins in southwestern Pangea …

Dinosaurs were remarkably successful during the Mesozoic and one subgroup, birds,
remain an important component of modern ecosystems. Although the extinction of non-avian …

Archosaurs have a 250 million year record that originated shortly after the Permian-Triassic
extinction event and is continued today by two extant clades, the crocodylians and the …

Abstract The Paraná Basin was filled by a sedimentary package deposited in successive
sedimentation episodes related to the tectonic events that hit the SW portion of the …

Triassic beds from Argentina and Brazil provide the most relevant fossil record of early
dinosauriforms in terms of numerical abundance and taxonomic diversity. This record …

The early evolutionary history of Ornithodira (avian-line archosaurs) has hitherto been
documented by incomplete (Lagerpeton) or unusually specialized forms (pterosaurs and …

Crown group Archosauria, which includes birds, dinosaurs, crocodylomorphs, and several
extinct Mesozoic groups, is a primary division of the vertebrate tree of life. However, the …

For over a century, the standard classification scheme has split dinosaurs into two
fundamental groups 1:'lizard-hipped'saurischians (including meat-eating theropods and …

The origin and evolutionary relationships of ornithischian dinosaurs are topics that have
undergone a series of substantial revisions. At present there are several competing …

The Upper Triassic (Carnian–Norian) Ischigualasto Formation has yielded a diverse
vertebrate fauna that records the initial phase of dinosaur evolution. Radioisotopic dates …