1. Department of Geology and Geophysics, University of Utah, Salt Lake City, UT 84112, USA.
2. Department of Forest Ecosystems and Society, Oregon State University, Corvallis, OR 97330, USA.
3. Department of Geological Sciences, California State University, Northridge, Northridge, CA 91330, USA.
4. Burke Museum of Natural History and Culture, University of Washington, Seattle, WA 98195, USA.
5. Department of Geology, Green River Community College, Auburn, WA 98092, USA.
6. School of Mechanical, Industrial and Manufacturing Engineering, Oregon State University, Corvallis, OR 97330, USA.