Step-Pool Stream (IMAGE) Geological Society of America Caption Step-pool sequences in Pike National Forest, Colorado, USA. (Academy study reach; photo taken on Dec. 12, 2014.) Credit Anne Chin and colleagues, Geological Society of America Bulletin. Usage Restrictions Credit Anne Chin and colleagues, Geological Society of America Bulletin. License Licensed 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.