Colorado's Front Range (image) Geological Society of America Caption Colorado's Front Range is showing glacial extent at the Last Glacial Maximum. Credit S.P. Anderson et al., GSA Field Guide 33, Chapter 1 Usage Restrictions Credit to S.P. Anderson et al. 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.