Transition from a weak and erratic geomagnetic field to a more stable one around 560 million years ago, inferred from palaeomagnetic measurements, suggests that the inner core may have solidified around that time, much later than thought.
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Driscoll, P. Geodynamo recharged. Nature Geosci 12, 83–84 (2019). https://doi.org/10.1038/s41561-019-0301-2
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DOI: https://doi.org/10.1038/s41561-019-0301-2
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True polar wander in the Earth system
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