Biological Versus Abiological Mechanisms Explaining Isotopically Heavy Isua Organic Matter
M. T. J. van der Meer, S. Schouten, J. W. de Leeuw and D. M. Ward
Netherlands Institute for Sea Research, Department of Marine Biogeochemistry and Toxicology, PO Box 59, 1790 AB Den Burg, Texel, The Netherlands
Montana State University, Department of Microbiology, MT 59717-0352, Bozeman, Montana, USA