Dinosaurs long dominated Earth's land ecosystems with a multitude of forms including plant-eating giants like Argentinosaurus ...

Many think dinosaurs first emerged on land well south of the equator that now forms part of Argentina and Zimbabwe, but they may have actually arisen in tougher conditions near the equator ...

Dinosaurs evolved from more primitive reptiles in the aftermath of Earth's biggest mass-extinction event caused by extreme volcanism at the end of the Permian Period about 252 million ... in their ...

based on the locations of the currently oldest-known dinosaur fossils, the evolutionary relationships among these early forms and Earth’s geography during the Triassic Period. This locale spans ...

Dinosaurs evolved from more primitive reptiles in the aftermath of Earth's biggest mass-extinction event caused by extreme volcanism at the end of the Permian Period about 252 million years ago.

Large parts of the dinosaur fossils record are still missing, especially from the Triassic Period when dinosaurs first evolved ... Gondwana around 250 million years ago following the end-Permian mass ...

They were the only group of dinosaurs to survive the Cretaceous mass extinction around 65 million years ago (not to be confused with the Permian-Triassic mass extinction that happened some 250 million ...

Some dinosaurs were getting bigger by the end of the Triassic. Climate changes during the period underwrote a vegetation boom that provided some previously omnivorous dinosaur lineages with enough ...

But mating was just one part of the reproductive process that has kept new generations of dinosaurs hatching on this planet since the Triassic ... for an extended period. Gary Todd via Flickr ...