THE WORK OF SNOW AND ICE. 



301 



TYPES OF MORAINES. 



The terminal moraine. — The thick accumulation of drift made at 

 the end of a glacier or at the edge of an ice sheet, especially where its 

 end or edge is stationary, or nearly stationary, for a considerable time, 

 is the terminal moraine. That part of the aggregation deposited beneath 

 the ice is sometimes called the lodge moraine (Figs. 275 and 276 ; see also 

 Fig. 235) ; that carried on the ice and dropped at its edge, the dump 

 moraine; and that pushed before the ice, the push moraine. Many 

 moraines marginal to the ice appear to be push moraines, when they 

 are really lodge moraines from which the ice has withdrawn (Fig. 277). 





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Fig. 277. — End of a glacier a few miles west of Kaslo on Lake Kootenai, B. C. A 

 lodge moraine from which the ice has withdrawn, giving it the appearance of a 

 push moraine. It is possible that the lodge moraine material has been pushed 

 up a little by re -advance of the ice. (Atwood.) 



The push moraine can rarely be distinguished, and the dump moraine 

 by no means always, after the disappearance of the ice. 



The ground moraine. — ^When a glacier disappears by melting, all its 

 debris is deposited. All the drift deposited beneath the advancing 



