New analysis shows several families of dinosaurs were likely thriving in North America in the latter days of the dinosaur era ...

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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 ...

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 ...

That's enough to draw an inference for most mammals during that era, according to Caleb Brown, curator of dinosaur systematics and evolution at the Royal Tyrrel Museum in Drumheller, Alta.