Isotopic evidence from carbon and sulphur points to the spread of anoxia and toxic sulphide as the chief culprits in at least one of a series of crises for marine ecosystems during the nascent stages of early animal evolution. See Letter p.80
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Shields-Zhou, G. Toxic Cambrian oceans. Nature 469, 42–43 (2011). https://doi.org/10.1038/469042a
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DOI: https://doi.org/10.1038/469042a