28 



The Badland Formations of the Black Hills Region 



GREAT PLAINS SECTION 



Figure 5— Diagram showing the chronological and stratigraphic succession 

 of the Cretaceous, Tertiary and Pleistocene formations of the western 

 states, in which fossil mammals are found. After Osborn. 



Slim Buttes show at the northern end 240 feet, near the middle 

 on the western side 180 feet, and at the southern end about 140 

 feet. The section on the north is made up of a soft white sand- 

 stone, 135 to 140 feet underlain by a 100-foot bed of dark to 

 light colored contorted clays. The sections measured on the 

 western side and at the southern end are more varied. It ap- 

 pears that these two sections may serve fairly well as repre- 

 sentative for this part of the country, hence are given here in 

 full. 



