1. School of Geosciences University of Louisiana at Lafayette Lafayette LA USA
2. Florence Bascom Geoscience Center U.S. Geological Survey Reston VA USA
3. Department of Geological and Environmental Sciences Appalachian State University Boone NC USA
4. Department of Geological Sciences University of Florida Gainesville FL USA
5. Centro de Geociencias Universidad Nacional Autónoma de México Querétaro Mexico
6. Department of Geosciences University of Arizona Tucson AZ USA