Abstract
Abstract An ITS is a calendar of magnetic reversals and palaeontological events. The elements of an ITS consist of: (1) a Global Polarity Time Scale (GPTS) based on distances between magnetic anomalies on the sea floor; (2) analytically precise radioisotopic ages used to calibrate the GPTS; (3) precise magnetobiostratigraphic correlations from which a biochronology is derived (including the correct correlation between magnetozones and sea floor anomalies).
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