ENVIKONMENT OF THE TITANOTHERES 



49 



Figure 36. — Map of western North America showing supposed routes of migration of animals 

 This map shows the general early Tertiary topography of the Great Plains, mountain ranges, northern and southern plateaus, and coast basins 

 and illustrates the supposed lines of Asiatic migration from the north and South American migration from the south. Modified after 

 F. L. Hansome (1915.1). 



