Last year's fashion for explaining a supposed 16-million-year periodicity in mass extinctions of species has been made to seem a little spurious. Defining a mass extinction is a more urgent need.
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Maddox, J. Periodic extinctions undermined. Nature 315, 627 (1985). https://doi.org/10.1038/315627a0
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DOI: https://doi.org/10.1038/315627a0
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