1. Department of Earth Science University of California Santa Barbara California 93106 USA
2. Earth Research Institute University of California Santa Barbara California 93106 USA
3. Department of Geosciences Pennsylvania State University University Park Pennsylvania 16802 USA
4. Department of Earth Sciences University of Oxford Oxford OX1 3AN UK
5. Department of Geosciences Boise State University Boise Idaho 83725 USA
6. Department of Geoscience University of Wisconsin‐Madison Madison Wisconsin 53711 USA
7. Yukon Geological Survey Whitehorse Yukon Y1A 2C6 Canada