54 W. D. KELLER 
Missouri. Two other applications of the earth resistivity method, 
traversing, and the location of a fault plane, were tested. 
TRAVERSING 
Stations were located along a straight line at known intervals and 
the resistivity of the rocks was measured at uniform depths. These 
resistivities were plotted against the station locations, giving a re- 
sistivity profile along the traverse. A change in the character of the 



































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rocks was expected to show an irregularity in the resistivity profile. 
That such was the case is shown in the curves and cross section on 
Graph No. 14. Complete depth determinations were made at each 
station and the resistivities were plotted for 5 depths, 20, 40, 60, 80, 
and roo feet. 
LOCATION OF FAULT 
By running traverses across a fault at three selected places a small 
variety of contacts were studied electrically. In one place the St. 
Peter sandstone was faulted against the Plattin limestone; in another, 
St. Peter sandstone was faulted against Maquoketa shale; and in the 
576 
