Antarctica's Cotton Glacier (IMAGE) U.S. National Science Foundation Caption Research in Antarctica's McMurdo Dry Valleys indicates that microbes are a source of organic material. Credit Christine Foreman, Montanan State 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.