Submission PDF Organism motility in an oxygenated shallow-marine environment 2.1 billion years ago

Evidence for macroscopic life in the Paleoproterozoic Era comes from 1.8 billion-year-old (Ga) compression fossils [ Han TM, Run-negar (1992), [ Bengtson S et. al. (2007), Paleobiology 33(3):351-381], and large colonial organisms exhibiting signs of coordinated growth from the 2.1 Ga Francevillian Series, Gabon. Here we report on pyritized string-shaped structures from the Francevillian Basin. Combined microscopic, microtomographic, geochemical, and sedimentologic analyses provide evidence for biogenicity, and syngenicity and sedimentological ichnological analyses. R.M. performed microtomographic analyses. isotope

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