LATE PALEOZOIC-MESOZOIC GEOMAGNETIC REVERSAL PATHS AND CORE-MANTLE BOUNDARY

An analysis of transitional virtual geomagnetic poles (VGPs) from the Late Permain-Early Triassic through to the Late Jurassic-Early Cretace ous, shows them to be located in preferred areas which coincide with p resent-day zones of fast seismic velocity at the core-mantle boundary (CMB), as has been observed for Late Cainozoic transitional VGP paths. It is therefore suggested that the similar geometries of Late Palaeoz oic-Mesozoic and Late Cainozoic polarity transitions have been impress ed by sources of the CMB which have persisted through the Mesozoic and Tertiary to the present.