Travel back in time and imagine the challenges and wonders of living in the Paleozoic Era. Mark Carney Wins Canadian ... on 401(k), Roth IRA money Photos: Millions without power in Spain, Portugal ...

The curious minds at What If transport us to the Paleozoic Era and envision what life would be like in this ancient period.

Prehistoric time line, geologic time scale, photos, facts ... The productive Paleozoic era gave rise to hard-shelled organisms, vertebrates, amphibians, and reptiles. Dinosaurs ruled the Earth ...

The Devonian, part of the Paleozoic era, is otherwise known as the Age of Fishes, as it spawned a remarkable variety of fish. The most formidable of them were the armored placoderms, a group that ...