Slawek M Tulaczyk¹, Jill Mikucki², Esben Auken³, Denys Grombacher⁴, Hilary A Dugan⁵, Nikolaj Foged⁶, Neil Foley⁷, Ross A Virginia⁸, Peter T Doran⁹, Krista F Myers⁹ and Ricardo Garza Giron⁷, (1)University of California Santa Cruz, Earth and Planetary Sciences, Santa Cruz, CA, United States, (2)University of Tennessee, Department of Microbiology, Knoxville, TN, United States, (3)University of Aarhus, Aarhus, Denmark, (4)Aarhus University, Aarhus C, Denmark, (5)University of Wisconsin, Madison, WI, United States, (6)Gaborone, Botswana, (7)University of California Santa Cruz, Santa Cruz, CA, United States, (8)Dartmouth College, Environmental Studies Program, Hanover, NH, United States, (9)Louisiana State University, Geology and Geophysics, Baton Rouge, United States