During the middle of the Cretaceous period, the polarity of Earth's magnetic field remained stable. A magnetic survey of oceanic crust formed during that time, however, suggests that the field intensity was surprisingly variable.
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Tarduno, J. Hum from the quiet zone. Nature Geosci 5, 161–162 (2012). https://doi.org/10.1038/ngeo1413
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DOI: https://doi.org/10.1038/ngeo1413
