1. Arts and Sciences Division; University of New Mexico-Gallup; Gallup NM USA
2. Department of Geology; Western Washington University; Bellingham WA USA
3. Department of Earth and Environmental Sciences; University of Minnesota Duluth; Duluth MN USA
4. Department of Earth Sciences; University of Minnesota-Twin Cities; Minneapolis MN USA
5. Saint Anthony Falls Laboratory; University of Minnesota; Minneapolis MN USA
6. Barr Engineering Co; Duluth MN USA