The Drill Core Section (IMAGE) Goethe University Frankfurt Caption This drill core section from the Blue Hole shows the annual layering (green-beige) and storm events (light-colored). Credit (Photo: Schmitt) 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.