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polarity zone The basic magnetic lithostratigraphic unit, defined by the measured magnetic polarity of a body of rock. A polarity zone is bounded above and below by a polarity reversal horizon or a polarity transition zone. Polarity zones may comprise a number of polarity subzones and be grouped into polarity superzones. When used formally the term is capitalized, e.g. Gauss Polarity Zone. See MAGNETOZONE.