s. Geochim. Cosmochim. Acta 72(12S). Morris, R.C. (1993) Genetic modeling for banded iron-formation of the Hamersley Group, Pilbara Craton, Western Australia. Precambrian Res. 60:243–286. Ohmoto, H. (2004) Archean atmosphere, hydrosphere, and biosphere. In The Precambrian Earth: Tempos and Events, Vol. 12, edited by P.G. Erickson, W. Alterman, D.R. Nelson, W.U. Mueller, and O. Catuneanu, Elsevier, Amsterdam, pp 361–388. Ohmoto, H., Watanabe, Y., and Kumazawa, K. (2004) Evidence from massive siderite beds for a CO2-rich atmosphere before 1.8 billion years ago. Nature 429:395–399. Ohmoto, H., Watanabe, Y., Ikemi, H., Poulson, S.R., and Taylor, B.E. (2006a) Sulphur isotope evidence for an oxic Archean atmosphere. Nature 442:908–911. Ohmoto, H., Watanabe, Y., Yamaguchi, K.E., Naraoka, H., Haruna, M., Kakegawa, T., Hayashi, K., and Kato, Y. (2006b) Chemical and biological evolution of early Earth: constraints from banded iron formations. In Evolution of Early Earth’s Atmosphere, Hydrosphere, and Biosphere—Constraints from Ore Deposit, edited by S.E. Kesler and H. Ohmoto, Geological Society of America, Denver, pp 291–331. Ono, S. (2008) Multiple-sulphur isotope biosignatures. Space Sci. Rev. 135:203–220. Ono, S., Eigenbrode, J.L., Pavlov, A.A., Kharecha, P., Rumble, D., Kasting, J.F., and Freeman, K.H. (2003) New insights into Archean sulfur cycle from mass-independent sulfur isotope records from the Hamersley Basin, Australia. Earth Planet. Sci. Lett. 213:15–30. Ono, S., Beukes, N., Rumble, D., and Fogel, M. (2006a) Early evolution of Earth’s atmospheric oxygen from multiple-sulfur and OHMOTO ET AL. 894