The Cambrian evolution of burrowing species is thought to have facilitated sediment mixing. However, sediment fabrics suggest that bioturbation remained insignificant until the appearance of more efficient sediment mixers in the Silurian.
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Gingras, M., Konhauser, K. Digging deeper. Nature Geosci 8, 825–826 (2015). https://doi.org/10.1038/ngeo2548
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DOI: https://doi.org/10.1038/ngeo2548
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