572 



CEXOZOIC EKA— AGE OF MAMMALS. 



Evidences of glaciers of this time are also found in the Vosges, in 

 the Pyrenees, and other high mountains of Central Europe. 



During this time also Europe was probably connected with Africa 

 by one or more highways, through the Mediterranean Sea. 



In Europe, as in America, there are evidences of a temporary re- 

 treat and readvance of the ice- sheet — i. e., of two glacial and an inter- 

 glacial period. 



2. Epoch of Subsidence — Champlain. — Following the epoch of ele- 

 vation was an epoch of subsidence, during which the same regions which 



Fig. 942.— Map of the British Isles and Norway, if subsided 1,200 to 2,000 Feet (after Lyell). The 

 lower shaded portion was not touched by Drift. 



were before most elevated became now most depressed. It is believed 

 that in Scotland the land was at least 2,000 feet below the present 

 level. By this depression a great part of Northern Europe was sub- 

 merged, and Great Britain was reduced to an archipelago of small 



