Thomas J. Algeo, University of Cincinnati (IMAGE) University of Cincinnati Caption Around 250 million years ago, most life on Earth was wiped out in an extinction known as the “Great Dying.” A team led by University of Cincinnati geologist Thomas J. Algeo, publishing in the GSA Bulletin, finds that the end came slowly from thousands of centuries of volcanic activity. Credit University of Cincinnati 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.