part 3] glaciation or north-eastern Ireland. 367 



some interesting points. At 700 feet the stream is cutting in 

 .schist, and there is little else in the drift ; but, slightly farther up 

 stream, there is an outcrop of the Chalk followed by that of the 

 Tertiary basalt, and both these rocks become plentiful in the drift 

 :so soon as their respective outcrops have been passed. Schist is 

 still present in great quantity and in very large masses, although we 

 are now above its outcrop, both physically and stratigraphically. 

 This shows conclusively that the movement of the ice was up- 

 stream, an inference which is confirmed by numerous other obser- 

 vations. 



On the low flat col between the head of the Grlenaan River and 

 that of the Issbawn Burn is an extensive 'floating bog', and in 

 "the latter stream (at an elevation of 1050 feet) gravelly drift 

 occurs, containing much schist and a boulder of purple porphyrite 

 (the nearest outcrop of which is at Knockans, some 2| miles away 

 to the north-east, and at a much lower level : nameby, 300 feet 

 above sea-level). 



About a quarter of a mile farther east, on the northern flank of 

 Timoyle, at an elevation of 900 feet, is an extensive deposit of red 

 sandy drift, consisting largely of Triassic debris and resting upon 

 basalt. It contains boulders of schist and vein-quartz, as well as 

 pebbles of quartzite from the Old Red Sandstone conglomerates 

 ■of Cross Slieve. 



The spur which separates the valley of the Issbawn Burn from 

 Glenaan has its highest point in Tievebulliagh (1346 feet), of 

 which the northern face, consisting of basalt, falls almost vertically 

 for 400 feet. On the summit of this escarpment of Tertiary basalt 

 are numerous boulders of Dalradian schist, showing that Tieve- 

 bulliagh was entirely overridden by the ice from the north. 



Grlenballyemon. — In Grlenballyemon are many sections in 

 Glacial deposits. Below Ballyfad, at 300 feet, the river cuts 

 through some 20 feet of bright-red boulder-clay, with lenticular 

 beds of red sand. The boulder-clay contains basalt, chalk, flint, 

 quartzite, vein-quartz, Old Red Sandstone, Cushendun quartz- 

 porphyry, and schist, the boulders being nearly all striated. For 

 a distance of nearly three-quarters of a mile, up to a level of 

 400 feet, the river-channel is in this boulder-clay, and a similar 

 deposit is exposed at intervals in both the river and its tributaries 

 up to 600 feet. 



Boulder-clay is also exposed in a small basalt-quarry on the side 

 of the main road opposite Retreat Station, on the Bally mena & 

 Cushendall Railway, at about 850 feet above O.D. Here a tongue 

 of the boulder-clay lies beneath a mass of basalt which has the 

 appearance of being in place, for, so far as can be seen, it is con- 

 tinuous with the flows on the slope above the quarry. The nether 

 surface of the basalt mass, exposed during the quarrying opera- 

 tions, was seen to be striated from north-east to south-west. The 

 tongue of boulder-clay appears as if it had been forced into the 

 plane between the successive flows of basalt from the scarp-face 

 at the northern end of the quarry. 



