BENNETT, Scott1, STREIG, Ashley2, LEVINSON, Ryan2, ROBERTS, Nick2, DUNNING, Andrew2, WELLS, Ray1, MADIN, Ian3, O'CONNOR, Jim E.1, REYNOLDS, Nathaniel D.4, PRINGLE, Patrick5 and GRANT, Alex6, (1)U.S. Geological Survey, 2130 SW Fifth Avenue, Portland, OR 97201, (2)Department of Geology, Portland State University, 1721 SW Broadway Ave, Portland, OR 97201, (3)Oregon Department of Geology and Mineral Industries, 800 NE Oregon St, Suite 965, Portland, OR 97232, (4)Cowlitz Indian Tribe (Ret.), Vancouver, WA 98665, (5)Science Dept., Centralia College, 600 Centralia College Blvd, Centralia, WA 98531, (6)U.S. Geological Survey, 345 Middlefield Road, Menlo Park, CA 94025