5e 2 [ pr0c - B.N.F.C, 



height, as the great stream swept around the promontory into the 

 great sinus north-east of Limavady, would soon have made inroads 

 upon the soft Triassic strata forming the slope. This would, when 

 melting supervened, have deprived the heavy cap of its retaining 

 buttress, inducing landslip after landslip, which have decked the 

 present slope with numerous jagged and pinnacled peaks. That 

 the period of down-slipping took place prior to the next stage of 

 glaciation* is rendered obvious by the occurrence of well-formed 

 moraines high up on the broken ground below the sheer cliffs. 

 And that the down-slipping is attributable to a great erosive force 

 impinging upon the escarpment, as described, finds confirmation 

 in the absence of such a disposition of strata and basalt anywhere 

 else,f along the neighbouring escarpments, however steep. 



INTERGLACIAL BEDS. 



Certain beds of silt, sand, gravel and boulders — some of very 

 large size and all well rounded — occur in the stream-bank at Bollee 

 bridge 3 miles from Limavady. They were previously mentioned 

 as associated, in origin at least, with the oldest Boulder-Clay; all 

 their materials have been derived from the basalt, yet they rest 

 upon the New Red Sandstone, a mile and a half west of the basalt. 

 They do not contain any other material, not even, so far as I could 

 find, either chalk or sandstone; while they are overlain by 12 feet of 

 red loose Boulder-Clay with numerous erratics of mica-schist, 

 metamorphosed grit, chalk and chalk-flints as well as basalt — a 

 deposit belonging to the succeeding stage of glaciation. The 

 melting and washing, which entirely separated the clay from these 

 beds of gravel, etc., certainly occurred between the first and third 

 stages ; had the washing been wide-spread we should expect much 



*It is, moreover, highly improbable that the sharp jagged features which 

 now deck the slope could have had pre-Glacial origin. Their very fresh 

 appearance would certainly not have survived the inflow of thick ice from the 

 north, had they existed then. 



1 The broken condition of the slope at the promontory of Garron Point, 

 near the entrance to Glenariff, is suggestive of causes similar to those which 

 operated at Eenevenagh. 



