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