THE THURM AN -WILSON FAULT 



387 



that the fault at Thurman changed into an anticHne near Stennett, 

 in which case there ought to be Nodaway coal north of the anticline. 

 The recognition of the fault should prove of considerable economic 

 value in preventing expenditure for prospecting for the Nodaway 

 coal seam north of the fault. 



The presence of the fault with uplift of 284 feet north of this 

 fault plane is a new factor of importance bearing on the question 



.er.l LejeiyM'^i ' 



Fig. 3 



of the depth of the Des Moines stage (the chief coal-bearing beds) 

 farther north in the west central part of the state, even though the 

 determination of the position of such beds is complicated by warp- 

 ing of the strata (if not by other faulting), by the great uncon- 

 formity beneath them, and by the pre- Cretaceous erosion of their 

 surface. The presence of thick beds of Dakota sandstone above 

 the Des Moines stage and of thick deposits of drift above the 



