1. Department of Geology, Appalachian State University, ASU Box 32067, Boone, NC 28608-2067, USA.
2. Instituto y Museo de Ciencias Naturales, Universidad Nacional de San Juan, España 400 (norte), CP 5400, San Juan, Argentina.
3. New Mexico Museum of Natural History and Science, 1801 Mountain Road NW, Albuquerque, NM 87104, USA.