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So far, no studies have systematically investigated microbial fossils in fluviolacustrine ferricrete composed entirely of nanophase goethite; thus, our understanding of biosignatures in such deposits is limited. Here, we report exceptionally well-preserved microfossils in laminated nanophase goethite from the Miocene McGraths Flat Lagerst\u00e4tte, New South Wales, Australia. Using scanning electron microscopy and energy dispersive spectroscopy, we identified a diverse range of fossil morphotypes, including bacteria and fungi. Syngenetic forms embedded in the sedimentary matrix and post-depositional endolithic colonizers were recognized. 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