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Fossil evidence of the existence of life during the Archean Eon of Earth history (>2500Ma) is summarized. Data are outlined for 48 Archean deposits reported to contain biogenic stromatolites and for 14 such units that contain a total of 40 morphotypes of described microfossils. Among the oldest of these putatively microfossiliferous units is a brecciated chert of the ∼3465Ma Apex Basalt of Western...
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