Hills (IMAGE) Princeton University Caption A Princeton-led team of geologists analyzed samples of inorganic and organic carbon from the hills of the Trezona Formation in South Australia to document one of the largest perturbations to the carbon cycle in all of Earth history. Credit Adam Maloof 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.