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The time between reversals has ranged between less than 100,000 to tens of millions of years with an average of about 300,000 years. It takes 1,000-8,000 years for one to be completed. It is thought that as a reversal approaches, the earth's magnetic field weakens.

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This is based on the fact that a number of crystalline or glass-like mineralssuch as obsidianmicaand zircon crystalscontain trace amounts of uranium-2 38 Udating is an unstable isotope.Fortunately, there are other methods available to researchers.

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