PLEISTOCENE OF EUROPE, NORTH AFRICA, AND NORTH AMERICA 379 



THE GLACIAL PERIOD IN THE ALPINE REGION 



Modified after mss. of Penck, 1909 



[Interpellations by the present writer in square [ ] brackets] 



R = Retreat 



M = Maximum >of Glaciation 



A = Advance I 



Prof. Penck is disposed to correlate the European Glacial 

 epochs with the American, as follows : 



Wiirm = Wisconsin 



Riss ^ Illinoian 

 Mindel = Kai.san 



