Alleged remains of tiny ancient bacteria could just be balls of protein.
References
Schieber, J. & Arnott, H. J. Nannobacteria as a by-product of enzyme-driven tissue decay. Geology, 31, 717 - 720, (2003).
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Ball, P. Nanofossils may be digested organic matter. Nature (2003). https://doi.org/10.1038/news030804-4
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DOI: https://doi.org/10.1038/news030804-4
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