THE OKMGIN AND ANTigUiTY OF MAX 75 



ill tlieir developiiiciit and even to assign tlic approxi- 

 mate years during which each was in vo^iic 'I'lie rongh 



From Birkncr. "Dcr Diluviale llciisch in Europa." 



Figure 2!). Flint Implements of the Aclieulian Epoch. 



stone age and the polished stone age are the popular 

 terms for the stages showing the most striking differences 

 in appearance and workmanship. In figure 14, the 

 most recent geologic epoch, the Quaternary, is divided 

 into the lower, middle, and upper (Quaternary, covering 

 a period of some 750,000 years. It will be noticed that 



