OLIGOCENE OF EUROPE, NORTH AFRICA, AND NORTH AMERICA 209 



Fig. 97. — Type of the Tittuiothcriuni Zone, Lower Oligocenc .\l)ove : Herd of titano- 

 theres of the genus Brontotherium on an aneiont flood plain in the South Dakota repi<jn. 

 After original by Charles R. Knight. Below : .Skeleton of the giant titanothere Brontotherium 

 gigas (female). Both in the American Museum of Natural History. 



