1. 1Department of Geosciences, Idaho State University, 921 South 8th Avenue, Pocatello, Idaho 83209, USA
2. 2Department of Earth and Atmospheric Sciences, Indiana University, 1001 E 10th St., Bloomington, Indiana 47408, USA
3. 3Department of Geological Sciences, California State University, Long Beach, 1250 Bellflower Boulevard, Long Beach, California 90840, USA
4. 4School of Geographical and Earth Sciences, University of Glasgow, 8NN, University Avenue, Glasgow G12 8QQ, UK