1. Department of Earth Sciences, University of Minnesota, 116 Church Street SE, Minneapolis, Minnesota 55455, U.S.A.
2. Department of Earth and Environmental Sciences, Columbia University, Lamont-Doherty Earth Observatory, Palisades, New York 10964, U.S.A.
3. Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027, U.S.A.
4. † Special collection papers can be found online at http://www.minsocam.org/MSA/AmMin/special-collections.html.
5. Earth-Life Science Institute, Tokyo Institute of Technology, 2-12-1-IE-12 Ookayama, Meguro-ku, Tokyo 152-8550, Japan