Evidence for dipolar fields during the Cobb Mountain geomagnetic polarity reversals

An earlier comparison of two North Atlantic sedimentary records of geomagnetic polarity reversals bounding the Cobb Mountain subchron with a volcanic record from Tahiti revealed striking similarities in the sequences of transitional virtual geomagnetic poles (VGPs), suggesting the presence of large-scale symmetries in these fields. Two new records of the Cobb Mountain subchron from the western Pacific are reported here which exhibit sequences of VGP positions that are very similar to those observed in the North Atlantic and Tahiti, providing evidence of dipolar transitional field during the Cobb Mountain reversals.