Pangaea, the Supercontinent (IMAGE) Brown University Caption More than 200 million years ago, nearly all the land on Earth was part of Pangaea. Animals could roam freely, yet they appear to have sorted themselves into regions. Researchers at Brown are figuring out why. Credit Jessica Whiteside, Brown University Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.