Field Guide Cover (IMAGE) Geological Society of America Caption Thirty-three geological field trips in the US Pacific Northwest comprise this new volume from The Geological Society of America, edited by Jim E. O'Connor, Rebecca J. Dorsey and Ian P. Madin. Credit Geological Society of America Usage Restrictions non-commercial/educational use only 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.