Brunhes–Matuyama reversal

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What Wikipedia says

The Brunhes–Matuyama reversal, named after Bernard Brunhes and Motonori Matuyama, was a geologic event, approximately 781,000 years ago, when the Earth's magnetic field last underwent reversal. Estimations vary as to the abruptness of the reversal.

Excerpt from the Wikipedia article “Brunhes–Matuyama reversal”, under the CC BY-SA 4.0 license. Read the article on Wikipedia