title: Evidence in pre-2.2 Ga paleosols for the early evolution of atmospheric oxygen and terrestrial biota:  comment and reply
authors.affiliation: Department of Earth and Planetary Sciences, Harvard University, Cambridge, Massachusetts 02138, USA.
authors.forename: H D
authors.initials: HD
authors.lastname: Holland
authors.forename: R
authors.initials: R
authors.lastname: Rye
mesh_terms: D000535:Aluminum / Q000737:chemistry; D001272:Atmosphere / Q000737:chemistry*; D001315:Australia; D019419:Evolution, Planetary; D019015:Geologic Sediments / Q000032:analysis* / Q000737:chemistry; D055593:Geological Phenomena; D005844:Geology; D006254:Hawaii; D007501:Iron / Q000737:chemistry*; D010100:Oxygen / Q000032:analysis*; D010163:Paleontology; D012987:Soil / Q000032:analysis*; D013019:South Africa; D014025:Titanium / Q000737:chemistry
chemical_list: D012987:Soil; D000535:Aluminum; D014025:Titanium; D007501:Iron; D010100:Oxygen