GLACIAL ACTION. 



37 



formed by masses of rock descending from the highest peaks, 

 and thrown to either side by the movement of the ice, or 

 deposited at the extremity of the glacier when the ice melted. 

 The former have been much modified by torrents entering 

 from the sides, after the glaciers disappeared, and now pre- 



Fig. 9. 

 Lateral Moraines. 



sent but detached mounds. In some glens, however, as 

 Sannox, terraces yet remain complete, but not of great extent. 

 The terminal moraines are better marked, fine examples being 

 visible at the mouths of Glen lorsa, Glen Catacol, Glen 

 Rosa, and others. The remarkable terraces at the opening 



Fig. 10. 



Terminal Moraine. 



of Glen Catacol skirt the valley on the south-west at a height 

 much exceeding any level the stream could now reach by the 

 joint effects of floods and high tides, and indeed surpassing 

 that which it could ever haver attained, even when the sea 

 covered the present maritime belt or terrace. We are, 

 therefore, inclined to regard these mounds and terraces as 

 terminal moraines, modified in their outlines by floods^ tides, 

 and ordinary river action. 



Still more remarkable are the lofty terraces at the mouth 



