Drilling Camp in the Horseshoe Valley (IMAGE) University of Bonn Caption Drilling camp in the Horseshoe Valley with flat drill in the foreground. Credit © Chris Turney Usage Restrictions This image may be used with the press release. 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.