National Geographic Dinosaurs of Gondwana & Laurasia Map: (folded from the Archives)

When dinosaurs emerged some 230 million years ago, Earth was ripe for a takeover. The massive Permian extinction had wiped out many potential competitors, and continental drift had created a supercontinent, Pangaea, that stretched from pole to pole. Over many millions of years, dinosaurs proliferated, adapting to every terrestrial environment.