Ediacaran Fauna (IMAGE) University of Rochester Caption University of Rochester researchers studied Earth’s magnetic field during the transformative Ediacaran Period, which spanned from about 635 to 541 million years ago. The research raises questions about factors that may have fueled the emergence of complex, multicellular organisms, such as Ediacaran fauna, notable for their resemblance to early animals. Credit University of Rochester illustration / Michael Osadciw Usage Restrictions None License Original 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.