IOWA ACADEMY OF SCIENCES. 



Shale, light blue 



Shale, dark blue 



Limestone, compact, gray 



Shale, gray 



Shale, light blue 



Sliale, brown 



Dolomite, brownish gray 



Dolomite, dark gray, coarse grained 



Dolomii e, gray 



Dolomite, pinkish gray, coarse grained. 

 Dolomite, light brown, coarse grained.. 



Shale, dark, slightly petroliferous 



Shale, dark, dolomitlc 



Dolomite, with some little chert 



Dolomite gray 



Dolomite, white 



Sand, pinkisli 



Sand, mixed with black shale 



Sand, clean, white, finegrained 



S ind, clean, wlilte, coarse grained 



Sand, darker, coarsegrained 



Dolomite, white, compact 



Dolomite, pink, compaci 



Dolomite, pinkish gray, compact 



Dolomite, pinkish, compact 



Sand, rusty, with some lime and chert.. 



Sand, rusty 



Sand, very sharp grained 



Sand, finegrained 



Dolomite, white, compact 



Dolomite, with brownish shale 



Sand, mi.xed with limestone and chert . 

 Uhert, white 



Sand, fine grained, with some shale and limestone. 



Drillings •.vished away 



Sand, biown, rusty 



Limestone and chert, whitish. 



Sand, limestone and chert 



Dolomite, grayish-brown.. . . 



P ' P- 



126 275 



165 440 



140 580 



38 618 



20 ' 638 



50 688 



49 737 



78 bl5 



