Plesiosaur fossil (IMAGE) University of Texas at Austin Caption Steve May, a research associate at the Jackson School of Geosciences, holds a fossil from a plesiosaur, an extinct marine reptile. The fossil is among the first Jurassic vertebrate fossils discovered and described in Texas. Credit Credit: Jackson School of Geosciences/ The University of Texas at Austin. Usage Restrictions Include photo credit 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.