Triassic Period

Earth was a very different place at the beginning of the Triassic. All of Earth's continents were combined into one supercontinent called Pangaea. And over 95% of the world's species became extinct in the largest mass extinction ever in history. A lot would change over the next 50 million years. Pangaea began to spread apart, and surviving species spread out and diversified as new ones evolved, including the first dinosaurs.

Image credits: main image, courtesy of Giant Screen Films; stumper, Eric Hamilton/© AMNH.