570 



CENOZOIC ERA— AGE OF MAMMALS. 



1. Epoch of Elevation— Glacial Epoch.— During the Early Qua- 

 ternary the whole of Northern Europe seems to have been elevated 

 1,000 to 1,500 feet and sheeted with ice. The continental margin was 

 considerably farther west than now, especially in the region of the 

 British Isles, which were then a part of the continent, there being then 

 no Baltic and North Sea. The area of highest elevation and of thickest 

 ice, and therefore of radial movement, was the Scandinavian Penin- 

 sula. From this area the ice moved westward into the Atlantic, as far 

 at least as the line of 100 fathoms ; southwestward over the British 

 Isles, southward over the beds of the Baltic and North Seas and into 

 Northern Germany as far as the frontiers of Bohemia; and south- 



FlG. 



Map of Outline of Coast of Western Europe, if elevated 600 Feet (after Lyell). 



eastward and eastward over Russia as far as Moscow, glaciating the 

 whole surface in its course. The southern boundary of the ice-sheet 



