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The authors observed the remanent magnetism of a group of roughly parallel dykes of basaltic andesite, which were found traversing the narrow gorge of Okura river, near Sendai. Most of these dykes are formed with basaltic andesite, while the largest one consists of quartz-bearing andesite. Most of the dykes are the intrusion in green tuff as narrow dykes with 0. 55. 7 meters in thickness. The geological time when the green tuff deposited is estimated as Miocene and the time when the dykes intruded into the tuff is estimated as later Miocene or upper Pliocene. In order to measure the magnetic orientation of these rocks, many specimens at every 50cm interval from each of these dykes and the surrounding green tuff were collected. The magnetic declination and inclination of each specimen were determined by an astatic magnetometer by which the magnetic moment of 10e. m. u. of specimen can be measured. The direction of the magnetization of all the dykes

Reverse Remanent Magnetism of Dyke of Basaltic Andesite