386 JOHN L. riLTON 



In order to express the relation of the beds that outcrop along 

 Middle River in the eastern part of Adair County it has seemed 

 desirable to represent the base of the Deer Creek substage as it 

 meets the bed of Middle River, which in a straight line is ten and 

 three-fourths miles northwest of the base of the Oread substage 

 where it outcrops in Harrison township. As the strata rise to the 

 north this makes it appear as if the Tecumsey shale became thicker 

 to the northeast, when in reality all of the strata become thinner 

 in that direction. In both these diagrams the dip is magnified 

 eighty-eight and a third times. 



Sriscos. 



Fig. 2 



The effect of this faulting on the location of outcrops is expressed 

 in the block diagrams representing the changes that have taken 

 place. It should be particularly noted that the limestone (Oread) 

 which, on the north side of the fault plane, appears at Lewis and 

 at the Fox quarries in the southwest part of Cass County, appears, 

 on the south side of the fault plane, close to Middle River as it 

 leaves Adair County, and also extends into the southwestern part 

 of Madison County (Figs. 3 and 4). 



IMPORTANT BEARINGS 



Coal. — For the first time we now recognize why Nodaway coal 

 found in the southern part of southwestern Iowa is not also found 

 in the northern part of southwestern Iowa, except in a small area 

 close to Thurman, Fremont County. Prior to this it was supposed 



