Abstract
Two sedimentary cores from the western Pacific display a palaeomagnetic record of the late Cretaceous long normal interval and the boundary reversed interval corresponding to seafloor spreading anomalies 33–34. Near the young end of this reversed interval, a systematic excursion of inclinations is observed in both cores. Samples are very stable to both alternating field and thermal demagnetization. Blocking temperatures and Curie points suggest that the remanence is carried primarily by magnetite, but with an additional contribution from hematite. Approximate sedimentation rates derived from biostratigraphy suggest that the excursion had a duration of between 46 000 and 54 000 yr and occurred about 236 000–303 000 yr before the succeeding polarity reversal. The excursion, thus, may represent an aborted geomagnetic field reversal.
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