Ben Kligman (IMAGE) Virginia Tech Caption Ben Kligman at the Thunderstorm Ridge fossil site at the National Petrified Forest in Arizona. Credit Photo courtesy by Adam Marsh Usage Restrictions Must credit Virginia Tech License Original 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.