Associate Professor Tristan Salles (IMAGE) University of Sydney Caption Lead author Associate Professor Tristan Salles from the School of Geosciences at the University of Sydney. Credit Stefanie Zingsheim/The University of Sydney Usage Restrictions for this story only 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.