Institution: | 1. Department of Geology and Geophysics University of Minnesota 310 Pillsbury Dr., S.E. Minneapolis, MN 55455 U.S.A.;2. Department of Geology University of Alberta Edmonton, AlbertaCanada, T6G 2E3;3. Department of Geophysical Sciences The University of Chicago 5734 S. Ellis Ave. Chicago, IL 60637U.S.A. |