Evidence of Ancient Crater (image) University of Alberta Caption This is a map showing the structure and contour of the Bow City crater. Color variation shows meters above sea level. Credit Alberta Geographic Survey/University of Alberta Usage Restrictions Alberta Geographic Survey/University of Alberta 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.