Tubular Features in 15 Million-year-old Impact Glass from the Ries Impact Structure, Germany (image) Geological Society of America Share Print E-Mail Caption This shows tubular features in 15 million-year-old impact glass from the Ries Impact Structure, Germany. See related article by H.M Sapers et al., http://dx.doi.org/10.1130/G35293.1. Credit H.M. Sapers et al./Geology Usage Restrictions Credit to authors & Geology Share Print E-Mail 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.