ALGEO (IMAGE) University of Cincinnati Caption University of Cincinnati Geology Professor Thomas Algeo examines rock cores in his lab. He and his co-authors discovered isotopic evidence that some mid-latitude seas remained ice free during the Marinoan Ice Age known as Snowball Earth. Credit Andrew Higley 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.