Sediment Cores (IMAGE) Geological Society of America Caption Sediment cores extracted from the deep central basin of Yellowstone Lake. Image courtesy Lisa Morgan. Credit Lisa Morgan Usage Restrictions Credit must be given to the creator. Only noncommercial uses of the work are permitted. License CC BY-NC 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.