The intermediate to acid Choiyoi Magmatic Province is the most conspicuous feature along
the Late Paleozic continental margin of southwestern Gondwana, and is generally regarded …

Fossil age data and molecular sequences are increasingly combined to establish a
timescale for the Tree of Life. Arthropods, as the most species-rich and morphologically …

Nonmarine biostratigraphic/biochronologic schemes have been created for all or parts of the
late Carboniferous–Middle Triassic using palynomorphs, megafossil plants, conchostracans …

The early evolution of archosauromorphs during the Permo-Triassic constitutes an excellent
empirical case study to shed light on evolutionary radiations in deep time and the timing and …

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 …

Dinosaurs have been major components of ecosystems for over 200 million years. Although
different macroevolutionary scenarios exist to explain the Triassic origin and subsequent …

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

We report U-Pb age determinations of carbonate nodules from an in situ paleosol horizon in
the Upper Permian Balfour Formation and from several horizons of pedogenic nodule …

The temporal transition from backarc extension to retroarc shortening is a fundamental
process in the evolution of many Andean-type convergent margins. This switch in tectonic …