1. School of Earth and Space Exploration, Arizona State University, Tempe, Arizona.
2. School of Environment and Te Ao Mārama—Centre for Fundamental Inquiry, The University of Auckland, Auckland, New Zealand.
3. Australian Centre for Astrobiology, School of Biological, Earth and Environmental Sciences, University of New South Wales Sydney, Sydney, Australia.
4. Department of Geology, Western Washington University, Bellingham, Washington.