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 Triassic dinosaurs from South Brazil are considered as some of the oldest known
worldwide, but their precise correlation to other early dinosaur occurrences have proven …

Upper Triassic rocks in northwestern Argentina preserve the most complete record of
dinosaurs before their rise to dominance in the Early Jurassic. Here, we describe a …

The rise and diversification of the dinosaurs in the Late Triassic, from 230 to 200 million
years ago, is a classic example of an evolutionary radiation with supposed competitive …

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

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 …

Characterizing the evolutionary history of early dinosaurs is central to understanding their
rise and diversification in the Late Triassic. However, fossils from basal lineages are rare. A …

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 …