Abstract
All the rock specimens collected from middle Pliocene Komoro group and Shigarami group, have shown the marked magnetic polarisations in the direction of highly westward trend ranging roughly from N 60°W to N 110°W. The pole positions indicated by these specimens are calculated to be situated within a range from Lat. 32°N to Lat. 35°S.A series of volcanic rocks including the middle Pliocene rock specimens above-mentioned and ranging from early Pliocene to late Pliocene, seems to indicate that the pole position would have shifted continuously from Lat. 75°N to Lat. 70°S during Pliocene times.As far as the writer's examination goes, it should be stressed that the direction of the earth's magnetic dipole axis in Pliocene age would have shifted from the North polar region, continuously southward to the South polar region.
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