The polarity sequence of Heirtzler and his co-workers for Neogene time is modified by compromise solutions between the polarity record in deep-sea sediments and oceanic magnetic anomalies. We have also revised the entire chronology by use of more recent isotopic age determinations of the stratigraphic ages of sediments overlying identified anomalies. The main features of the revised time scale are a general reduction of the length of polarity periods during Eocene and later times, and an expansion of Paleocene polarity periods.

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