These periods occurred | THIRD 0R GLACIAL EPOCH 

 in the Pleistocene Era. 1 comprising 15 possibilities of alternately 

 ( arctic and genial climate. 



E ERA. 



Period of greatest cold. 



80.000 years 



Prehistoric 

 Era. 



PLEISTOCENE ERA. 



Horses incised on Antler, by Mesolithic Man. — La Madelaine. 



