1. U.S. Geological Survey, Geosciences and Environmental Change Science Center Denver CO USA
2. Institute for Rock Magnetism, Department of Earth and Environmental Sciences University of Minnesota Minneapolis MN USA
3. U.S. Geological Survey, Geology, Geophysics, Geochemistry Science Center Denver CO USA
4. U.S. Geological Survey, Southwest Biological Science Center Flagstaff AZ USA
5. Center for Snow and Avalanche Studies Silverton CO USA