1. Department of Geological Sciences and Institute of Arctic and Alpine Research University of Colorado Boulder Boulder CO USA
2. Department of Earth, Atmospheric and Planetary Sciences Massachusetts Institute of Technology Cambridge MA USA
3. Department of Engineering Science and Physics College of Staten Island, City University of New York New York NY USA
4. Department of Geology Grand Valley State University Allendale MI USA
5. Department of Ocean Sciences and Institute of Marine Sciences University of California Santa Cruz CA USA