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a. An authoritative study concluded that the early biosphere contained oxygen before the earliest fossils (bacteria) formed. Iron oxides were found that “imply a source of oxygen enough to convert into insoluble ferric material the ferrous solutions that must have first formed the flat, continuous horizontal layers that can in some sites be traced over hundreds of kilometers.” Philip Morrison, “Earth’s Earliest Biosphere,” Scientific American, Vol. 250, April 1984, pp. 30–31.
Charles F. Davidson, “Geochemical Aspects of Atmospheric Evolution,” Proceedings of the National Academy of Sciences, Vol. 53, 15 June 1965, pp. 1194–1205.
Steven A. Austin, “Did the Early Earth Have a Reducing Atmosphere?” ICR Impact, No. 109, July 1982.
“In general, we find no evidence in the sedimentary distributions of carbon, sulfur, uranium, or iron, that an oxygen-free atmosphere has existed at any time during the span of geological history recorded in well-preserved sedimentary rocks.” Erich Dimroth and Michael M. Kimberley, “Precambrian Atmospheric Oxygen: Evidence in the Sedimentary Distributions of Carbon, Sulfur, Uranium, and Iron,” Canadian Journal of Earth Sciences, Vol. 13, No. 9, September 1976, p. 1161.
“What is the evidence for a primitive methane-ammonia atmosphere on earth? The answer is that there is no evidence for it, but much against it.” Philip H. Abelson, “Chemical Events on the Primitive Earth,” Proceedings of the National Academy of Sciences, Vol. 55, June 1966, p. 1365.
b. R. T. Brinkmann, “Dissociation of Water Vapor and Evolution of Oxygen in the Terrestrial Atmosphere,” Journal of Geophysical Research, Vol. 74, No. 23, 20 October 1969, pp. 5355–5368.
[From “In the Beginning” by Walt Brown ]
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