1. Department of Geology University of Illinois at Urbana‐Champaign Urbana IL USA
2. Department of Terrestrial Magnetism Carnegie Institution for Science Washington DC USA
3. Department of Earth Sciences University of Oregon Eugene OR USA
4. Division of Earth Sciences National Science Foundation Alexandria VA USA
5. Department of Geology Colgate University Hamilton NY USA
6. NOAA Pacific Marine Environmental Laboratory Hatfield Marine Science Center Newport OR USA