Paleomagnetic study of the Upper Cretaceous part of the Scaglia Rossa pelagic limestone in the section at Gubbio, Italy, yielded a sequence of magnetic polarity zones that corresponds precisely with the polarity sequence inferred from marine magnetic anomaly profiles. This study shows the existence of a long normal polarity zone corresponding to the Cretaceous Quiet Zone, establishes the presence of the controversial interval of reversed polarity between marine magnetic anomalies 33 and 34, and places the Cretaceous-Tertiary boundary near the top of the reversed polarity interval immediately preceding anomaly 29.

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