At intervals, the polarity of the Earth's magnetic field reverses. The timescale for this reversal is unclear — in fact, it seems to depend on the latitude of the site from which the geological data are extracted.
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Merrill, R. Time of reversal. Nature 428, 608–609 (2004). https://doi.org/10.1038/428608a
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DOI: https://doi.org/10.1038/428608a
