34 



THE WHITE RIVER BADLANDS 



ing often referred to as the White Eiver group. Later as 

 the methods of correlation became more refined and as 

 representative fossils came more abundantly and in better 

 condition from the hands of the collectors, giving better 

 opportunity for comparison with similiar fossils in other 

 parts of the world, the lower beds were found to be equi- 

 valent to the Oligocene and the upper beds to the Miocene, 

 chiefly Lower Miocene. This is now the accepted correla- 

 tion. Pliocene deposits are know to occur along and to the 



GREAT PLAINS SECTION 



PLEISTOCENE 

 PLIOCENE 



OREGONSECJION 



MIOCENE 



OLIGOCENE 



UTAH SECTION 



Figure 7 — Diagram showing the chronological and stratigraphic suc- 

 cession of the Cretaceous, Tertiary, and Pleistocene formations 

 of the western states, in which fossil mammals are found. Osborn. 

 1907. 



