882 



DRAKE — THE GEOLOGY OF INDIAN TEREITORY. [Sept. 3, 



Swimmer- Arlington Section. ^ 



' Red and blue clay shales and 

 marls interstratified with 

 thin sandstone and scarcer 



limestone beds 250-]- 



Sandstone and conglomerate 500 

 Gray arenaceous clay shale 

 beds alternating with 

 sandstone beds in about 

 the proportion of ten of 

 shale to one of sandstone 500 



Red and blue clay shales and 

 marls interstratified with 

 thin sandstone beds and 

 more rarely thin lime- 

 stone beds 250-f 



Muscogee-Cushing Section . . ■{ Alternating blue and gray 



clay shales and sandstones 200 



Sandstone and a little clay 

 shale 500 



Gray clay shales and a few 

 thin sandstone beds 100 



Blue and red clay shales and 

 marls alternating with 

 thin sandstone and a few 

 thin limestone beds 500+ 



Sandstone and a little clay 

 shale 500 



Alternating beds ot gray 

 clay shale and thin sand- 

 stones , 200 



In general terms, the section farthest to the south, or the Cal- 

 vin-Wewoka section, shows two thick sandstone groups of beds with 

 an intervening and an overlying clay shale. The other three 

 sections show one principal group of sandstone beds overlain 

 and underlain by clay shales. It may be possible, however, 

 that the lower sandstone group of the Calvin-Wewoka section 

 belongs to the Poteau group, as seems to be the case judging from 

 lithological evidence. If this be true, there are three generalized 



Adair- Pawhuska Section . 



