John Tracey¹, Kathryn Hobart², Calvin Rusley¹, Herdís Steinsdóttir³, Rachel Weisend⁴, Alexandra Atlee Phillips⁵, Daan R Speth⁵, Rafael Laso Perez⁶, Benjamin J Tully⁷, Larry Miller⁸, Woodward W Fischer⁵, Alex L Sessions⁵ and Victoria J Orphan⁵, (1)Princeton University, Department of Geosciences, Princeton, NJ, United States, (2)Department of Earth Sciences, University of Minnesota, Minneapolis, MN, United States, (3)University of Southern Denmark, Odense, Denmark, (4)Texas A&M University-Corpus Christi, Corpus Christi, TX, United States, (5)California Institute of Technology, Pasadena, CA, United States, (6)Max Planck Institute for Marine Microbiology, Bremen, Germany, (7)University of Southern California, Center for Dark Energy Biosphere Investigations, Los Angeles, CA, United States, (8)USGS MS/480, Menlo Park, CA, United States