Golden ammonite (IMAGE) University of Texas at Austin Caption Ammonite fossil From the Ohmden quarry, Posidonia shale lagerstatte. Credit Sinjini Sinha/ The University of Texas at Austin Jackson School of Geosciences. 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.