Abstract
Samples of Quaternary basaltic rocks and Tertiary sediments of Yamaguchi Prefecture, West Japan, have been collected and their natural remanent magnetizations and other magnetic properties measured. The mean directions of the natural remanent magnetization of the Quaternary basalts is nearly parallel to the present geomagnetic field, and that of the Tertiary sediments of Miocene age also agrees with the present geomagnetic field, but the Paleogene sediments show very large deviations in the mean direction of their remanent magnetization from the present geomagnetic field. Some reversals of the remanent magnetization in situ were found among the samples of early Quaternary age. Virtual paleogeomagnetic dipole positions have been estimated from these data for Tertiary and Quaternary times in Yamaguchi Prefecture, West Japan.
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