360 MAJOR A. B. DWEBEYHOUSE 0> T THE [vol. lxxix, 



and Orra More, cuts the watershed, and connects the head of a 

 feeder of the Owenaglush River, a tributary of the Glendun River, 

 with the head of Glenshesk (fig. 3, p. 365). 



When this Owenaglush channel was operative, the ice on the 

 northern face still stood at about 1000 feet, impounding a lake in 

 the head of Glenshesk. and the waters of this lake overflowed the 

 col between Croaghan and Orra More. The present level of this 

 col is 950 feet ; but there is a thickness of at least 30 feet of peat 

 on the watershed, as can be seen in open section. There is a 

 well-marked channel through the watershed, and the existing 

 stream, the Shelton Burn, is diminutive when compared with the 

 size of the valley in which it flows. 



Another and much larger channel connects Glendun with the 

 valley of the Carey River. The watershed, or intake, of this 

 channel, which runs along the line of the main road from 

 Cushendun to Bailycastle, is at a level of 840 feet. Loughaveema, 

 the vanishing lake, lies in the channel (PI. XXIII). 



The Loughaveema channel was probably operative to some extent 

 while the Owenaglush channel was still active ; but at this stage it 

 could only have carried the drainage from the ice, or, perhaps the 

 overflow of a small lake held up in the head of the valley of the 

 Clady Burn. As the ice-front receded, however, a much larger 

 volume of water was diverted to this course. The channel is cut 

 through the Dalradian schists, and is broad, deep, and streamless. 



The records of the further stages of the first retreat of the 

 Scottish ice have been obliterated by the subsequent re-advance, 

 and it is in connexion with the great morainic system already 

 described that we can again take up the chain of events. 



When the ice stood at the level of the outermost ridge of the 

 moraine the only lake of any importance impounded by it was that 

 in the head of Grlenshesk, which still overflowed by the Shelton 

 Channel. 



The floor of this part of Grlenshesk is occupied by roughly 

 stratified gravels consisting, for the greater part, of schist-pebbles, 

 and this material appears to have been washed in through the 

 Owenaglush Channel by way of the Altahullin Burn. 



The moraine crosses the Grlenshesk River at Coskemnacally, at 

 about 500 feet above sea-level ; the river has been deflected by it, 

 and passes round its western end through a gorge cut in the 

 Dalradian schists. 



With a slight reti'eat of the ice a small channel (' lateral escape ' 

 type) was opened on the line of the road above Coskemnacally. at a 

 height of 540 feet, and there are indications of a gravel-terrace or 

 delta at about this level in the upper part of the valley. On the 

 opening of this channel the Shelton Channel became inoperative, 

 and the drainage henceforth was by way of the great valley between 

 Knocklayde and Croaghan. 



The next stage is marked by the cutting of a great series of 

 overflow-channels on the northern flank of Bohilbreaga (see fig. 1, 

 p. 356). At this period the ice-front stood against the northern 



