1 Department of Earth, Planetary, and Space Sciences, Center for the Study of Evolution and the Origin of Life, and Molecular Biology Institute, University of California, Los Angeles, CA 90095; Penn State Astrobiology Research Center, University Park, PA 16802; Astrobiology Research Consortium and schopf@ess.ucla.edu.
2 Center for the Study of Evolution and the Origin of Life, and Penn State Astrobiology Research Center, University Park, PA 16802; Astrobiology Research Consortium and.
3 Australian Centre for Astrobiology, School of Biological, Earth and Environmental Sciences, and.
4 Australian Centre for Astrobiology, School of Biological, Earth and Environmental Sciences, and Australian Research Council Centre of Excellence for Core to Crust Fluid Systems, University of New South Wales, Randwick, NSW 2052, Australia;
5 Astrobiology Research Consortium and Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109; and Department of Geoscience, University of Wisconsin-Madison, Madison, WI 53706;
6 Astrobiology Research Consortium and Department of Geoscience, University of Wisconsin-Madison, Madison, WI 53706;
7 Departamento de Oceanografía, Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción, Concepción, Chile.
8 Australian Centre for Astrobiology, School of Biological, Earth and Environmental Sciences, and Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109; and.