A Rubber Cast and Impression Fossil (IMAGE) Drexel University Caption Dr. Ted Daeschler, Drexel University, shows a rubber cast and impression fossil of the armored fish Phyllolepis thomsoni, a new species he discovered along a Pennsylvania highway roadcut. Credit Drexel University 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.