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STUDIES, SCIENTIFIC AND SOCIAL 



of drift is usually the same as that of well-marked moraines, 

 large blocks of stone being distributed throughout its mass. 

 It is this which mainly distinguishes drift from alluvial or 

 shore deposits, in which the materials are always more or 

 less assorted and stratified ; but the angular forms of many 

 of the contained blocks and the striated surfaces of others 

 are also characteristic. Besides the terminal moraines of 

 extinct glaciers, lateral moraines are also left along the 



Fig. 10.— easedale tarn, withjmoraikes. 



slopes of open valleys from which glaciers have retreated. 

 As a whole, moraines are well distinguished from all 

 accumulations formed by water, and it has not been shown 

 that any other agency than glaciers is capable of forming 

 them. In all recently glaciated countries they are to be 

 found more or less frequently, and thus afford an excellent 

 first indication of the former existence of glaciers. 



(2) Smoothed and rounded rocks, called in Switzerland 

 " roches moutonnees/' from their supposed resemblance at 



