GSA Special Paper 528 Cover (IMAGE) Geological Society of America Caption This is an overview of the Marias River canyon looking downstream, showing the meandering nature of the active channel of the Marias River, the steep walls of the canyon, and landforms and plant communities discussed in this book. Credit Photo by John W. Fisher Jr. Usage Restrictions Credit: The Geological Society of America and John W. Fisher Jr. 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.