662 



ELECTRICAL METHODS 



[Chap. 10 



TABLE 66~-Continued 

 RESISTIVITIES OF CONSOLIDATED SEDIMENTS 



Rock 



Grinneld argil- 

 lite 



Grinneld argil- 

 lite 



Argillite (Mis- 

 soula group); 

 pre-Cambrian, 

 thin-bedded, 

 platy argillite; 

 resembles 

 Grinneld 



Conglomerates 

 Great conglom- 

 erate outcrop 



Calumet & Hecla 

 conglomerates 



Sandstone 

 Eastern sand- 

 stone 



Eastern sand- 

 stone 



Muschelkalk ss. 

 (Triassic) 



Sandstone (Ter- 

 tiary Oligo- 

 cene) ; soft, 

 friable ; ex- 

 tremely fine 

 grained ss. ; 

 pale green to 

 yellowish and 

 buff; contains 

 thin beds of 

 lignite 



Locality 



N^ sec. 23, 

 T32N R20W, 

 Flathead 

 Co., Mon- 

 tana 



(Water's 

 Edge) 



Sec.27, T32N 

 R20W, Flat- 

 head Co., 

 Montana 



Eagle Harbor, 

 Mich. 



Michigan 



Michigan 



Lorraine 



Coal Creek 

 Road, Flat 

 head Co., 

 Montana 



Resistivity in ohm-cm 



102 los 



9.6 



8.7 

 7.4 



W ! 10« 10» 10' 



1.71 



1.1 

 1.0 



1.1 



1.3 

 1.4 

 8.0 

 8.2 

 7.7 



1.4 

 1.6 

 1.5 

 1.4 

 1.5 



3.5 



4.3 



7 



9.8 

 6.2 

 6.7 

 4.8 



-1.2 



1.1 



2 1.3 



