1. Department of Geology, Colgate University, Hamilton, New York 13346, U.S.A.
2. † Special collection papers can be found online at http://www.minsocam.org/MSA/AmMin/special-collections.html.
3. Eastern Geology and Paleoclimate Center, U.S. Geological Survey, P.O. Box 628, Montpelier, Vermont 05602, U.S.A.