Well, are they or aren't they? The debate over whether some of the accretions known as stromatolites are really of biological origin, and thus can provide information about the early history of life on Earth, takes a fresh turn.
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Walter, M. Old fossils could be fractal frauds. Nature 383, 385–386 (1996). https://doi.org/10.1038/383385a0
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DOI: https://doi.org/10.1038/383385a0