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Response to Comment on "Iron Isotope Constraints on the Archean and Paleoproterozoic Ocean Redox State"

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Science  13 Jan 2006:
Vol. 311, Issue 5758, pp. 177
DOI: 10.1126/science.1118420

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We reported a secular trend in iron isotope values of Precambrian sedimentary pyrite and related it to the changing redox state of Precambrian oceans. We restate that the iron cycle before 1.8 billion years ago was different from that now and reflected the rise of atmospheric oxygen and the subsequent moderate atmospheric oxygen level in the Paleoproterozoic.

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