40 



THE WHITE RIVER BADLANDS 



Gray sands with pipy con- 

 cretions 



Loose gray sands with gray 

 and pebbly streaks 



Stratified and cross-bedded 

 sands 



Unconformity 



Volcanic ash 



Pink clays 



Volcanic ash 



Light buff-gray shales .... 

 Sandstones 



Greenish sands and sandy 

 clays 



Greenish sands 



--4525 



Pierre shale? 



3725 



Figure 10 — Section from Round Top to Adelia, Sioux county, Ne- 

 braska. Above the Pierre shale to 3725 is Chadron formation, 

 3725 to 4275 is Brule, 4275 to 4390 is Gering, 4390 to 4525 is 

 Arikaree. Darton, 1905. 



The Oreodon Beds. The Oreodon beds, so named be- 

 cause of the abundant remains of Oreodons found in them, 

 are made up chiefly of massive arenaceous clays, lenticular 

 sandstones, and thin layers of nodules. A particular feature 

 of the beds is the color banding. The general color is a gray 

 or faint yellow, but this is often much obliterated by hori- 

 zontal bands showing some shade of pink, red or brown. 

 They are present in greater or less prominence over large 

 areas, particularly in the Big Badlands, and in places be- 



