researcher photo (IMAGE) Rice University Caption Duncan Keller is a postdoctoral researcher in Rice’s Department of Earth, Environmental and Planetary Sciences and the lead author of the study published in Nature Geoscience. Credit (Photo by Jeff Fitlow/Rice University) Usage Restrictions Must credit Jeff Fitlow/Rice University. 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.