Edaphosaurus Fossils (IMAGE) U.S. National Science Foundation Caption Edaphosaurus fossils came from late Carboniferous to early Permian times, 300-280 million years ago. Credit Harvard University Museum of Comparative Zoology 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.