1. 1Department of Geology, San José State University, One Washington Square, San Jose, California 95192, USA
2. 2School of Earth & Sustainability, Northern Arizona University, P.O. Box 4099, Flagstaff, Arizona 86011, USA
3. 3Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, 550 Stadium Mall Drive, West Lafayette, Indiana 47907, USA
4. 4Geology Department, University of Puget Sound, 1500 N. Warner St., Tacoma, Washington 98416-1048, USA