I 



590 LAND MAMMALS IN THE WESTERN HEMISPHERE 



Nevada an obsidian spearhead in association with the bones 

 of an elephant or fmastodon, and other such instances have 

 been reported. In these cases the doubt is as to the geological 

 antiquity of the "finds," for the implements are of the type 

 made by the pre-Columbian Indians. 



In brief, there is no convincing evidence that either North 

 or South America was ever inhabited in prehistoric times by 

 races of men different from those first encountered by the 

 European discoverers. 



