Vol. 68.] 



GLACIATION OF THE BLA.CK COMBE DISTRICT. 



433 



liave been in operation at the same time. After the Nettle-Crags 

 Channel had been cut to a shallow depth, the ice appears to 

 have retreated and allowed the Bramire Channel to be opened up. 

 Then followed an advance which threw the water back again into 



the upper channel, so that 

 its floor was lowered nearly 

 to that of the Bramire 

 Channel. 



Withdrawal of ice from 

 the lower part of Bramire 

 then allowed the water to 

 fall, by a cross-cut, into 

 that channel, near jNettle 

 Crags. The subsequent open- 

 ing-up of the upper part, and. 

 lowering of the floor, left 

 the connecting channel as 

 a hanging valley, opening 

 upon the eastern wall of the 

 Bramire Channel. This is^ 

 shown in the accompanying 

 figure drawn from a photo- 

 graph and sketch made on 

 the spot (fig. 10, p. 432). 



The three channels — Dam- 

 kirk, Nettle Crags, and 

 Bramire — form a parallel 

 sequence cut across the 

 ridge of Borrowdale rocks, 

 as shown in the diagram 

 (fig. 7, p. 429). The first 

 two appear to have been 

 connected with the Kinmont 

 Channel, but the Bramire- 

 Wood Channel was probably 

 fed to some extent by water 

 from the Corney Channel, 

 and the fluctuations of the 

 ice-margin just discussed 

 may have coincided with the 

 fluctuations which led to the 

 cutting of the transverse 

 valley at GiUfoot (p. 426). 



(iii) The Western Slope of Black Combe. 



(«) The Tarn-Dimples Channel. — Tarn Dimples, situated 

 between 200 and 450 yards south of Holegill Beck, is a notch in 

 the hillside of rather striking appearance. From its situation, it. 

 seems certain that the mouth of Holegill was blocked by a lobe of 



