The productive Paleozoic era gave rise to hard-shelled organisms, vertebrates, amphibians, and reptiles. Dinosaurs ruled the Earth in the mighty Mesozoic. And 64 million years after dinosaurs went ...

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Non-bird dinosaurs lived between about 245 and 66 million years ago, in a time known as the Mesozoic Era. This was many millions of years before the first modern humans, Homo sapiens, appeared.

and the Mesozoic Era, when the archosaurian reptiles, which includes the dinosaurs, came to dominate.' The cause of the Permian-Triassic extinction event is not fully understood. Various theories have ...

Paleontologists analyze concretions—hard orbs of minerals that can collect around material like bone—and discover fossils of mammals that lived on Earth just after an asteroid killed the ...

Scientists have discovered the oldest known cerapodan dinosaur fossil in Morocco, discovered back 168 million years.