Brunhes–Matuyama reversal

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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.[1][2] Opinions vary as to the abruptness of the reversal: it may have occurred over several thousand years,[3] or much more quickly,[4][5][6] perhaps within a human lifetime.[7]

The apparent duration at any particular location varied from 1,200 to 10,000 years depending on geomagnetic latitude and local effects of non-dipole components of the Earth's field during the transition.[3]

The Brunhes–Matuyama reversal is a Global Boundary Stratotype Section and Point (GBSSP), selected by the International Commission on Stratigraphy as a marker for the beginning of the Middle Pleistocene, also known as the Ionian Stage.[8] It is useful in dating ocean sediment cores and subaerially erupted volcanics.

See also

References

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Further reading


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