A widespread biotic turnover occurred around the time of the Sturtian glaciation. Microfossil analyses show that one regional extinction pre-dates the glacial advance, challenging the more severe models for glacial effects in the Neoproterozoic era.
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Corsetti, F. Extinction before the snowball. Nature Geosci 2, 386–387 (2009). https://doi.org/10.1038/ngeo533
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DOI: https://doi.org/10.1038/ngeo533
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