https://www.forbes.com/sites/davidbressan/2021/08/17/scientists-use-burnt-flints-and-ceramics-to-reconstruct-weakening-of-earths-geomagnetic-field-9000-years-ago/
Researchers reconstructed the magnetic field that prevailed on Earth between approximately 10,000 and 8,000 years ago analyzing pottery and burnt flints from archeological sites.
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