Additional Data to the Paleomagnetic Pole Positions for the Cretaceous Rocks in Yamaguchi Prefecture West Japan.

In the previous report (1966), the present author submitted a datum on the Cretaceous paleomagnetic pole positions due to the natural remanent magnetizations (nrm) of some inkstones and quartz porphyry rocks of Yamaguchi Prefecture, West Japan. In the brief note, the additional data to the Cretaceous pole positions mentioned above, with respect to the similar rocks of the same region of Japan, have been shown. The nrm of some red shales of the Cretaceous inkstone series and also the nrm of Cretaceous andesites were measured by means of an astatic magnetometer. The stability of these specimens was checked by the storage test in the laboratory, which show that the specimens submitted have rather stable nrm. Locality 1 is situated in somewhat northern of Locality 4 which is the previous sampling locality for the inkstone series. Locality 2 is about 20 km westwardly aparted from Locality 4. Locality 3 overlaps Locality 4. All of the rock specimens of Localities 1, 2, and 4 belong to the same inkstone series, and the rocks of Locality 3 are andesites.