Stalagmites in Southern China (IMAGE) Proceedings of the National Academy of Sciences Caption Stalagmites in southern China preserve detailed geomagnetic oscillations and centennial geomagnetic reversal events. Credit PNAS 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.