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note
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Supported by the Studienstiftung des Deutschen Volkes (J.J.B.) and American Chemical Society Petroleum Research Fund (R.B.). We thank J. Gressier and RioTinto Exploration for samples, the AGSO Isotope & Organic Geochemistry staff for technical assistance, J. Kamprad for x-ray diffraction analyses, T. Blake, D. Des Marais, L. L. Jahnke, C. J. Boreham, D. S. Edwards, T. G. Powell, D. E. Canfield, and M. R. Walter for advice, and J. M. Hayes, A. Knoll, and an anonymous reviewer for their thoughtful comments. G.A.L. and R.E.S. publish with the permission of the Executive Director of AGSO.
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