Fossils (IMAGE) Virginia Tech Caption Fossils of ammonites (an extinct group of cephalopods) collected from the field site in Alaska. This is one group of organisms the were greatly affected by the end-Triassic extinction. Photo credit: Benjamin Gill Credit Virginia Tech Usage Restrictions Virginia Tech credit 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.