-372 MAJOR A. B. DWERRYHOUSE ON THE [vol. lxxix, 



drift, usually current-bedded, and in some places showing signs of 

 a terraced arrangement, although this is not well-marked. 



At Linford Bridge is a terrace-like mass of boulder-clay covered 

 by red gravel, and the stream is cutting in gravel ; but, although 

 the valley is large, the stream is diminutive and inactive, and the 

 section very poor. The bed of the stream contains basalt and 

 many angular fragments of flint. The terrace is continued along 

 the side of Glenarm as far as the Roman Catholic Chapel at Feys- 

 town, although its level falls from 740 feet at Linford Bridge to 

 about 680 at Feystown. 



Near the road-junction north-west of Craigy Hill, at a height 

 of 750 feet, is a small lateral moraine, consisting of gravel, which 

 is chiefly basaltic, but contains also chalk, flint, chalcedony, red 

 ironstone, lithomarge, and a purple porphyrite similar to that 

 which occurs on the coast at Cushendall. 



The lower part of Glenarm contains great quantities of drift, 

 both boulder-clay and gravel, the contents being basalt, chalk, 

 flint, purple porphyrite, gneiss, schist, and Ailsa Craig eurite, all 

 rocks which occur on the north. 



There are several striated surfaces on both sides of the valley, 

 and these, taken together with the erratics, show definite evidence 

 of a movement of ice up the valley. This inference is supported 

 in a most striking manner by the drainage-channels now to be 

 described. 



At an early stage during the retreat of the ice, when the upper 

 parts of the plateau were first freed from ice, lakes were held up 

 in both arms of the valley, Owenacloghy Water and Linford Burn. 

 In the earliest stage the glacier flowing up the Owenacloghy Water 

 was still confluent with the ice of Glencloy and the Braid River ; 

 but that in the Linford valley on the east was unable to surmount 

 the watershed, and at one stage its front stood across the valley 

 from Skeagh (1127 feet) to Robin Young's Hill (1262 feet), thus 

 holding up a lake in the valley of the Skeagh Water. 



This lake overflowed southwards by way of the col at the head 

 of the Skeagh Water, between Creeve (1186 feet O.D.) and Agnews 

 Hill (1558 feet) into the Cross Water, a tributary of the Glen- 

 whirry River. The overflow cut a broad channel, at a level of 

 1050 feet, which falls south-westwards and winds considerably. 

 Its sides are steep, its floor is covered with peat, and throughout 

 the greater part of its length it is streamless, although at its 

 southern end is a small flow which is tributary to the Cross Water. 



The retreat of the ice-edge from Skeagh Hill towards Craig- 

 cluggan allowed the waters of the lake to escape westwards into 

 the valley of the Owenacloghy Water, and a channel was cut 

 immediately south of the road from Skeagh Bridge to Owena- 

 cloghy Bridge at a height of 960 feet ; later, two parallel channels 

 south of the road were cut at 950 and 940 feet respectively. 



At this stage, the ice in the North Channel stood against the 

 eastern side of the great ridge Agnews Hill — Robin Young's Hill 



