20 Conjoined Crystals (IMAGE) University of California - Santa Barbara Caption This is a transmission electron microscopy image of carbon spherules from the Younger Dryas Boundary 30 cm below the surface in Gainey, Michigan. Credit UCSB 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.