Abstract
Abstract The palaeomagnetic palaeointensities, natural remanent magnetic intensities of ocean-floor basalts and MAGSAT anomalies over the central Pacific and North Atlantic oceans suggest that the geomagnetic field was appreciably stronger during the ∼ 35 Ma long Cretaceous ‘quiet’ zone of fixed normal polarity. It is shown here that two MAGSAT anomalies over this ‘quiet’ zone in the central and eastern Indian Ocean, one over the Broken Ridge and the other south of Sri Lanka, which have been interpreted differently by other workers, also support this correlation of the geomagnetic field's long-term polarity stability and strength.
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