410 MAJOR A. E. DWEEEYHOUSE ON THE [vol. lxxix,. 



porphyry, both of which rocks are local,, also striated Silurian 

 grit, Tertiary basalt, and flint. The material is distinctly morainic- 

 in character, and extends up to the 900-foot contour. The country 

 below this, right down to the Lough at Omeath village, is also- 

 covered with similar material disposed in long flat mounds. Strias 

 on the hillside west of Orneath point almost due south. 



The deep embayment in the eastern side of Clermont Cam 

 contains similar drift (in which there are sections 30 feet deep), 

 forming a terrace at a level of 600 feet. 



In The Windy Gap is a frontal moraine of considerable- 

 dimensions, through which there is an ill-defined streamless 

 channel falling southwards. The moraine contains many angular 

 blocks of granite, quartz- porphyry, and doierite, all of which occul- 

 ta situ in the area immediately on the north. 



Immediately south of The Windy Cap is a shallow lake, about 

 half a mile long, at a level of 600 feet. It is held iip by a frontal 

 moraine which crosses the valley at Cloughmore. Below this 

 point the valley, sometimes called Clenmore, contains great 

 quantities of drift exhibiting a roughly terraced arrangement ; 

 but there are no further frontal moraines, unless the accumulations- 

 of gravelly materials at Biverstown, which will be mentioned 

 later, can be so described. 



The drift-level on the western slopes of Carlingford Mountain 

 is well, defined by the limit of cultivation, which is at about 

 900 feet above O.D. ; but this does not mark the upper limit of 

 the ice, as some erratics occur on the summit of the mountain. 



Striae on an inlier of Silurian rocks in the centre of Clenmore, at 

 about 380 feet, show that the ice which crossed The Windy Gap 

 extended at least thus far southwards, and there seems little doubt 

 that it reached the foot of the valley and passed out to sea. 



The western face of Carnavaddy is heavily drift-covered in the 

 townlands of Anaverna and Doolargy, and at a height of 600 feet 

 a stream cuts through a great lateral moraine consisting of brown 

 sandy clay, with many subangular blocks of granite. The thickest 

 part of the moraine appeal's to be at the forking of the two streams,, 

 where there is a section 60 feet deep with the stream still flowing 

 on drift. Most of the granite-boulders are in the lower part of 

 the section. 



Farther up stream above the moraine is a plateau of drift 

 200 yards wide, with another moraine roughhy parallel to the first 

 on its upper side. The drift of the terrace is stratified, and was 

 deposited in the waters of a lake which stood at a level of 870 feet, 

 and overflowed by a channel between Carrabane and Carnavadd}^ 

 This channel discharged its waters into another lake which occupied 

 the valleys on the side of Slievestucan, in the townland of Bally - 

 makellet, and the waters overflowing from this cut a series of 

 channels in the spur which runs south-westward from the summit 

 of The Castle, by way of The Round Mountain to Bellurgan 

 House. These channels will be described later. 



The broad valley occupied by the various streams which unite to 



