. Early geophysical papers of the Society of Exploration Geophysicists . R3W R 2 W VERTICAL MAGNETIC INTENSITY cottnum MTtmm. » CAjmu 19 3 2 scmj or *mwc»K AttA Co ) C CL^ Fig. 2.—Map showing vertical magnetic intensity, 1932. though it may be greater in the later work. In the recent survey, the contours lie closer together and the general pattern practically dupli- cates that of 1927, but the plane of the feature appears to have been tilted toward the west. The base point, SE. corner, Sec. 36, T. 11 N., R. 3 W., is identical 332

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