Palisade Sill near Alpine, N.J. (IMAGE) U.S. National Science Foundation Caption Palisade Sill near Alpine, N.J., has geologic remnants of the end-Triassic extinction event. Credit Terrence Blackburn and Paul Olsen 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.