University of Michigan, Department of Geological Sciences, 2534 C.C. Little Building, 425 East University Avenue, Ann Arbor, MI 48109-1063 United States
University of Michigan, Department of Geological Sciences, 2534 C.C. Little Building, 425 East University Avenue, Ann Arbor, MI 48109-1063 United States
University of Manchester, Department of Earth Sciences, Manchester, M13 9PL United Kingdom
Carnegie Institution of Washington, Department of Terrestrial Magnetism, 5241 Broad Branch Road, NW, Washington, DC 20015 United States