Drill Core (IMAGE) Proceedings of the National Academy of Sciences Caption This is a drill core of rocks recording deposition within Paleolake Nonesuch. Credit Image courtesy of Sarah P. Slotznick 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.