part 3] GLACIATION OF NORTH-EASTERN IRELAND. 393 



debris. The gravels are brown, and rest upon the stratified sands. 

 They contain chiefly basalt-boulders, many of which near the top 

 of the section are very large, and smaller pieces of chalk, flint, 

 red iron-ore (Tertiary), and chalcedony. The fluidal rhyolite of 

 the Quarrytown type is plentiful. The gravel forms a mound, 

 .and the section is 15 feet deep. 



In a large pit 500 yards south of the last-mentioned is a section 

 ■of similar sand and gravel, in which the bedding is extremely 

 irregular and contorted. It is current-bedded in parts, and the 

 •current-bedding dips in directions varying between west and north- 

 west. There is a thin bed of buttery clay at the base of a mass 

 •of contorted sand. The clay shows slickensides, and apparently 

 formed a gliding plane within the mass. 



The surface of this area is undoubtedly morainic in character, 

 bearing numerous irregular mounds, and a distinct moraine crosses 

 the main road north of Moattown. 



Between Ballymena and Broughshane the Braid River and its 

 tributary the Devenagh Burn flow through an extensive flat con- 

 sisting of basaltic gravels ; while immediately above Broughshane 

 the valley of the Braid is much contracted, owing to a moraine- 

 like ridge which runs at right angles to the river, and separates the 

 valley of the Devenagh Burn from that of the Creevamoy Burn. 



In the neighbourhood of Buckna, and between that village and . 

 The Sheddings, are innumerable basalt-boulders and occasional 

 fragments of chalk and flint, doubtless derived from Glenarm. 



The north-western face of Sliemish Mountain bears several 

 striated surfaces of basalt, the striae indicating a flow in a south- 

 westerly direction. Flint-pebbles occur up to 750 feet on the 

 northern face of Sliemish. 



Sliemish Mountain (1437 feet) is a steep-sided cone formed by 

 a neck of olivine-dolerite, and is visible from nearly all the summits 

 in Antrim, Londonderry, Tyrone, and Down. The view from the 

 top is very striking and extensive, and from it can be made a 

 study of the general trend of the drumlins and other mounds of 

 glacial material in the surrounding country. 



In the upper part of the Braid Valley the axes of the mounds 

 trend from north-east to south-west, that is parallel with the 

 valley ; hut in the neighbourhood of Broughshane and Ballymena 

 they curve round towards the north-west. These directions are 

 indicated, to some extent, by the contour-lines on the 1-inch map ; 

 but the feature is much more striking when viewed from the top 

 of Sliemish. 



In the valley of the Clogh Water and its tributaries the deposits 

 are strikingly similar to those of the Braid Valley, and here again 

 the axes of the mounds curve round north-westwards west of New- 

 town Crommelin. In this case the northward movement of the ice 

 ;at the foot of the valley is indicated by the overflow-channels 

 on the spur of Slieverush. These are at 770, 750, and 530 feet 

 respectively, and all fall northwards. 



Near Drumadoon, a mile north of Clogh Mills, is a gravel-pit 



2 e 2 



