内容記述（抄録等）  Previously the present author (1965) reported some magnetic data on the remanent magnetization of Columbia River Tertiary basalts and classified these samples into six groups; normal, intermediate and reversed group at each of two localities, i.e. Snake River and Asotin Creek. In this paper, an additional datum is given such as a datum obtained by thermo magnetic analysis. And also the direction of the natural remanent magnetization (nrm) is reclassified into six groups and overall statistics on the nrm of these samples is summerized. Nrms of each groups are shown in figures 16, where the solid circles show downward dip angle of nrm and open circles upwards. The large circular lines show a pair of cones having the vertex at the center of the Schmidt's net and generating by the NS horizontal line had an axis lied on the direction of the present geomagnetic field; aparting from the horizontal plane with 68 in degrees. In figures 7 and 8, the typical thermo magnetic curves are drown for respective groups and also Curie point frequency distributions are shown obtained by such thermo magnetic curves. Figure 9 shows the static stability of overall samples; thedeviation of nrm within a sample and the order of Fisher's (Fisher 1953) 95% confidence circle for the dispersion of directions of nrms. Excepting the intermediate groups of each locality, the mean directions of nrms for four groups; R_A, R_S, N_A, and Ns are shown, where R means reversely magnetized group and N for normal and also the inferiors A and S mean sampling localities, Asotin Creek and Snake River respectively. Calcurated virtual paleogeomagnetic dipole positions for each group are plotted on the stereogram as in figure 11 (after the previous report, 1965).
