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New data has recently become available on the length and duration of the Permo-Carboniferous reversed superchron (PCRS, Kiaman). This data set is reviewed, and the upper boundary is found to occur at approximately 260 Ma and the lower boundary at about 315 Ma. The frequency of reversal before and after the onset of the PCRS is similar to that observed before and after the Cretaceous quiet zone (KQZ). The earth’s magnetic field seems to have two states, one with reversal frequencies exceeding 1 per million years and the other with no or few reversals for 10’s of millions of years. The KQZ occurred at a time of continental dispersal and the PCRS at a time of continental amalgamation.

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