Abstract
Petrographic analysis of the Oboke phyllitic sandstone shows that the quartz crystals are arranged in the manner suggested by the writer's hypothesis which was proposed last year in this journal., From this study, it is ascertained that, as the amount of differential movement in the rocks increases, the quartz crystals undergoes higher degree of rotation, and that several types of petrofabric diagrams of the quartz crystals result from varying amount of the differential movement., Moreover, it is suggested that the types of the petrofabric diagram is determined not only by the amount of the movement but also by the velocity of the movement., The recrystallization of quartz appears to begin at a certain point of each crystal and continue further until the whole crystal is replaced by a new one., This process takes place in the solid state, and the recrystallized quartz grain retains the orientation of the original one.,
