March-April 2016 GSA Today cover (IMAGE) Geological Society of America Caption Prof. Axel von Hillebrant (Technical University, Berlin) driving the golden spike into the bed that marks the base of the Jurassic System (Lower Jurassic Series; Hettangian Stage), Aug. 20, 2011. Prof. von Hillebrandt led the team that investigated the Kuhjoch section in the Northern Calcareous Alps of western Austria, where the GSSP is located, and prepared the GSSP proposal, which was subsequently approved by ICS and ratified by IUGS. Credit GSA Today Usage Restrictions Credit GSA Today 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.