scanning and transmission electron microscopy show a correlation of calcified layers and natural sulfur suggestive of a task of bacterial sulfate-reduction in the precipitation of calcium carbonate, a view per the concept that precipitation of carbonate in stromatolites could also be influenced by bacterial processes. This identical method, when used to evaluate molecular-level traits of carbonaceous material preserved within the Strelley Pool Formation of Australia (~three.35-3.forty three Ga), led the authors to an analogous conclusion: the residual natural material has molecular characteristics more in line with a biotic than an abiotic origin 64.
Investigation of carbonaceous materials within the ~3.46 Ga Apex chert by De Gregorio and
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