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“Geomagnetic excursions” are shorter-lived but significant changes to earth's magnetic field. Excursions happen about 10 times as often as pole reversals.

The well-studied Laschamps event between 42K and 41K years ago, caused Earth's magnetic pole to drift south and decline in strength to ~5% of its current strength.

The weakening of the magnetosphere is claimed to have contributed to the extinction of Australian megafauna and the extinction of the Neanderthals.

https://en.wikipedia.org/wiki/Laschamp_event
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