THE CONTINENTAL GLACIERS OF THE "ICE AGE" 315 



lobate moraine may often be followed by the belts of small pit 

 lakes (see Fig. 336). 



Eskers. Intra-morainal features, or those developed beneath 

 the glacier but relatively near its margin, include the " serpentine 



kame," esker, or, , ^ . __ 



as it is called in 

 Scandinavia, the os 

 (plural osar) (Fig. 

 340). These di- 

 minutive ridges 

 have a width sel- 

 dom exceeding a 



fo^r rlo or^rl o FlG ' 34 - view looking along an esker in southern 



J.CW 1UU.&, cLLHJL di -_ . , , , N 



. 'Maine (after Stone). 



height a few tens 



of feet at most, but with slightly sinuous undulations they may be 

 followed for tens or even hundreds of miles in the general direction 

 of the local ice movement (Fig. 341). They are composed of 



Sco/e of miles. 



FIG. 341. Outline map showing the eskers of Finland trending southeasterly to- 

 ward the festooned moraines at the margin of the ice. The characteristic lakes, 

 of a glaciated region appear behind the moraines (after J. J. Sederholm). 



