Evidence in pre-2.2 Ga paleosols for the early evolution of atmospheric oxygen and terrestrial biota:  comment and reply
The major points of disagreement between Holland and Rye and Ohmoto concern (1) the behavior of ferric iron. (2) the mechanisms of Fe loss. (3) the identification of real paleosols, and (4) the ages of some paleosols.
Ohmoto
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Faculty of Science, Tohoku University, Sendai, Japan.
D001272:Atmosphere / Q000737:chemistry*; D019419:Evolution, Planetary; D005290:Ferric Compounds / Q000032:analysis*; D019015:Geologic Sediments / Q000032:analysis* / Q000737:chemistry; D055593:Geological Phenomena; D005844:Geology; D007501:Iron / Q000737:chemistry*; D010100:Oxygen / Q000032:analysis*; D010163:Paleontology; D012987:Soil / Q000032:analysis*; D013019:South Africa; D014025:Titanium / Q000737:chemistry
D005290:Ferric Compounds; D012987:Soil; D014025:Titanium; D007501:Iron; D010100:Oxygen