414 MAJOR A. R. DWERRYHOUSE OX THE [vol. lxxix, 



the exception of certain current-bedded portions, quite regular. 

 The erratics are similar to those found at Bellurgan and Rock- 

 mai'shall House. 



In another section, between the railway and road-bridges at 

 Riverstown, boulders of basalt are extremely common in the lower 

 part of the section, while rocks from the north-west predominate 

 higher up. The section was partly grassed over and covered by 

 slips and talus, consequently it was impossible to ascertain without 

 considerable excavation whether there is a definite line of demar- 

 cation between the basaltic drift and that lying above it. In 

 the light of the relationship of the beds in the cliff-sections 

 shortly to be described, I am inclined to ascribe the basaltic drift 

 to earlier ice, probably Scottish, which came by way of the Newiy 

 Valley, over The Windy Gap and so down Glenmore, and the upper 

 deposit to the later glacier which came round the western side of 

 the hills by way of Bellurgan. 



Between Giles Quay and Rathcor Lower the beach is bounded 



Fig. 9. — Section in the sea-cliff at the mouth of the river 

 helow Riverstown. 



1 = Older moraine. 2 = Stratified sands and gravels. 

 3 = Newer moraine. 4 = River. 



by cliffs of boulder-clay, sands, and gravels, which occasionally 

 reach a height of 50 feet. 



On the eastern side of the mouth of the river at Riverstown are 

 exposures of strongly current-bedded sands and gravels containing 

 Silurian grit, Carboniferous Limestone, granophyre, diorite, and a 

 few small pebbles of Tertiary basalt, all of which (with the 

 exception of the basalt) are local. The current-bedding dips 

 southwards at about 20°. Resting upon these gravels are mounds 

 of brown boulder-clay containing large boulders. The gravels just 

 described extend for about 100 yards eastwards along the sea-cliff, 

 where the section illustrated in fig. 9 (which clearly indicates 

 their relationship to the other deposits) is seen. 



Between the fishermen's cottages and the end of the road at 

 Rathcor Lower is a continuous section, a quarter of a mile long and 

 about 50 feet high. At the western end of the section the following 

 beds are exposed : — 



(4) Brown boulder-clay, with few stones. 



(3) Brown sands, strongly current-bedded towards the east. 



(2) Brown clay, with few stones. 



(1) Fine white sands interbedded with fine gravel, often highly contorted. 



