Dana E Peterson, Cornell University, Ithaca, NY, United States; USGS Crustal Geophysics and Geochemistry Science Center Denver, Denver, CO, United States, Carol Finn, USGS, Geology, Geophysics and Geochemistry Science Center, Denver, CO, United States and Paul Bedrosian, USGS, Geology, Geophysics, and Geochemistry Science Center, Denver, CO, United States