Fossil Microorganism (IMAGE) University of California - Los Angeles Caption This is a 3.465 billion year-old fossil microorganism from Western Australia. Credit J. William Schopf/UCLA Center for the Study of Evolution and the Origin of Life 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.