1. Department of Geology, University of Wisconsin Oshkosh, Oshkosh, WI, USA
2. Department of Earth and Atmospheric Sciences, Saint Louis University, St. Louis, MO, USA
3. Byrd Polar Research Center, The Ohio State University, Columbus, OH, USA
4. School of the Environment, Washington State University, Pullman, WA, USA
5. Department of Geosciences, The University of Arizona, Tucson, AZ, USA
6. Geophysical Institute, University of Alaska Fairbanks, Fairbanks, AK, USA