Latitudes at which ancient salt deposits occur show that Earth's magnetic field has always aligned along its rotation axis. One possible implication is that ancient global glaciations were not caused by a realignment of this axis.
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R. H. Rainbird
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Irving, E. Same old magnetism. Nature 444, 43–44 (2006). https://doi.org/10.1038/444043a
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DOI: https://doi.org/10.1038/444043a
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