152 Life of Surface Deposits. 



If the bogs, swamps and minor surface de- 

 pressions furnish no horse or camel bones, 

 then must it be accepted that the glacial cold 

 drove these mammals away or destroyed 

 them. It is plain that the mammoth elephant 

 got him a coat of fur and lived through the 

 cold spell of the times. The fossils of this 

 group of Surface beds, such as the Mastodon, 

 the Mammoth, the Broad-faced Ox and Mylo- 

 don, though deeply interesting in themselves, 

 bring added historical attraction from the fact 

 that a large part of their geological period 

 overlaps that of prehistoric man. 



THE MYLODON. 



There were three of these sloth-like ani- 

 mals in North America during this period 

 designated by the term Surface beds the 

 Megatherium, the Megalonyx and the Mylo- 

 don. We have chosen to represent the group 

 by the Mylodon because we happen to have 

 a good pair of claw bones for illustration. The 

 animal was larger than the rhinoceros, fifteen 

 to eighteen feet long, and a browser of trees. 



