1. School of Earth, Environment and Society, Bowling Green State University, Bowling Green, OH 43403, USA
2. Department of Geological Sciences, Albion College, Albion, MI 49224, USA
3. School of Geography, Geology and the Environment, University of Leicester, Leicester LE1 7RH, UK
4. Department of Earth and Environmental Sciences, New Mexico Institute of Mining and Technology, Socorro, NM 87801, USA
5. New Mexico Bureau of Geology and Mineral Resources, New Mexico Institute of Mining and Technology, Socorro, NM 87801, USA