Stromatolitic microorganisms in and on top of fluid-escape structures of the 3.2 Ga Moodies Group

Sebastian Reimann , Christoph Heubeck , Martin Homann , Deon Johannes Janse van Rensburg & Michael Wiedenbeck
The global record of early life is only poorly preserved, but has an ark in the 3.2 Ga Moodies Group of the Barberton Greenstone Belt, South Africa and Eswatini. It preserves silicified photosynthetic and sulfate-reducing metabolic signatures in sandstone-dominated, terrestrial to shallow-marine strata. Large fluid-escape structures are common in thick-bedded kerogen-laminated sandstones of (sub-)tidal facies. We document and interpret silicified, massive and laminated carbonate aggregates and beds, both of likely microbial origin, within and on...
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