520 



A. G. LEONARD 



The beds near the middle portion of the Lance formation are well 

 exposed in the bluffs on the south side of the Cannon Ball River 

 near Shields where the following section occurs: 



Feet Inches 



Soil and subsoil ■ . ■ 4~5 



Sandstone, yellow to gray., soft and friable 31 



Shale, gray and yellow 10 



Sandstone, gray and yellow, containing thin shale layers and 



brown, carbonaceous streaks 38 



Shale, gray, containing iron concretions 15 6 



Shale, black and brown, carbonaceous; containing dark brown 



ferruginous concretions 6-10 



Shale, gray 15 6 



Shale, brown, carbonaceous 1 



Shale, gray, sandy 3 



Shale, brown, carbonaceous iS 



Coal 6 



Shale, black, coaly 1 4 



Shale, gray, sandy 1 1 



Shale, brown, carbonaceous 1 6 



Shale, very sandy 1 6 



Shale, brown, carbonaceous 2 6 



Shale, gray 7 6 



Sandstone, gray, soft, with shale layer near middle, 2-4 feet 



thick 44 



Shale, gray 8 



Unexposed to river 20 



Total 219 



One of the characteristics of the Lance beds, exhibited in many 

 widely scattered localities, is well shown in this section; namely, 

 the many brown, carbonaceous layers which are present, often 

 forming a conspicuous feature of the formation, as along the Little 

 Missouri River. It will be noted that the beds are here composed 

 about evenly of shales and sandstones, though the latter are con- 

 fined to three thick members. 



About thirty miles below Shields, and ten or twelve miles 

 above the mouth of the Cannon Ball, the lower Lance beds are 

 exposed, together with the underlying Fox Hills sandstone, as shown 

 in the following section: 





