Abigail R. D’Ambrosia (a), William C. Clyde (a), Henry C. Fricke (b) & Philip D. Gingerich (c)
(a) Department of Earth Sciences, University of New Hampshire, Durham, NH 03824, USA. E-mail: adambrosia@gmail.com
(b) Department of Geology, Colorado College, Colorado Springs, CO 80903, USA.
(c) Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, MI 48109, USA.