Sulphur River (image) University of Calgary Caption Andrew Leier examined zircons from Lower Cretaceous sandstone near the Sulphur river in the Grande Cache, Alberta area. The prominent sandstone cliff is the Cretaceous sandstone. Credit University of Calgary Usage Restrictions None 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.