The Triassic beds of Argentina and Brazil play a key role in understanding of the origin and early diversification of Dinosauria. The first recorded dinosaurs include some predatory forms, such as …| Letters from Gondwana.
Dinosaurs likely originated in the Middle Triassic and the first unequivocal dinosaur fossils are known from the late Carnian. The main environmental changes that occurred at the very end of the Tr…| Letters from Gondwana.