432 



31 K. BEENARD SMITH 0>" THE 



[Sept. 1912^ 



The channel is five-sixths of a mile long, and its floor falls from 

 320 to 200 feet, that is, 144 feet per mile. 



(6) The !Nettle-Crags Channel. — This is a dry valley which 

 lies directly in line with the Kinmont Channel, and is connected 

 ■with it hy a boulder-strewn hollow in the drift. Commencing in 

 drift-covered granite, it becomes pronounced where cut in andesite^ 

 the western wall forming a precipitous crag some 50 feet high 

 (fig. 9, p. 431). 



Near Settle Crags the main channel divides, and encloses an 

 island formed of banded ashes. 



At its head the floor is nearly 30 feet below the Damkirk intake;, 

 but, since the valley is fairly shallow at that point, there is every 

 reason to suppose that its initiation led to the abandonment of the- 

 Damkirk Channel. It is half a mile 

 about 90 feet, that is, at the rate of ] SO feet per mile. 



long, and its floor descends 



(c) The Bramire-Wood Channel. — This channel runs 

 from north to south, close to, and nearly parallel with, the Nettle- 

 Crass Channel. It also commenced in drift-covered granite, 



Fig. 10. — Bramire-Wood Channel, looking eashvards. 



[The Nettle-Crags Channel is in the middle distance. A feature is formed by 

 the gravels of BootleBant on the sky-line. A cross-cut between the two 

 channels occupies the centre of the picture. Black Combe is on the 



right.] 



becoming pronounced after it crosses the boundary and enters 

 the andesite. Its bottom is quite flat and dry throughout the 

 upper half of its course, below which, however, there is a small 

 drain. About half-way down the craggy eastern wall is 80 feet or 

 more in height ; the western side is mostly drift-covered (fig. 10, 

 above). The floor falls from 270 to 180 feet, or at a rate of 180 

 feet per mile — about the same rate as the last. 



The relationships between the Bramire and Kettle-Crags Channels 

 seem to have been complicated by oscillatory movements on the 

 part of the ice-margin, and different portions of both channels may 



