286 Scientific Proceedings, Royal Dublin Society. 



a retaining wall bides most of the drift-sections. A little over 

 half a mile west of the gravel bar, which connects Corkbeg with 

 the mainland, the beach-gravels are seen lying on the platform, 

 and are overlaid by boulder-clay and head. 



White Bay.— The rock-platform may be followed round 

 Carlisle Fort a few feet, above high- water mark. On the south 

 side of the Fort, beach-gravels come in beneath the head. The 



following section occurs here : — 



Feet. 



Upper head, . . . . . . 3 



Stony red boulder-clay, . . . . 4 



Lower head, . . . . . . . . 12 



Well-rounded gravel, . . . . 7 



Rock-platform. 



From this point the rock-surface, on which the beach-gravel 

 rests, rises eastwards to Grlan-na-gow, and then falls again to the 

 southwards, as already explained (p. 259). 



Where a road descends to the shore, 400 yards south of Grlan- 

 na-gow, the section in the cliffs is as follows : — 



Feet. 



Weathered boulder-clay and rubble, . . 2-3 



Red boulder-clay, . . . . . . 4 



Lower head (base hidden by talus), . . 12 

 Rock-platform. 



The rock- platform is 6 feet above high- water mark of ordinary 

 spring-tides; and from here to Roche's Point, it forms a well- 

 marked feature. It is nearly always overlain by lower head, 

 which is seen to change in composition as the rocks in the pre- 

 glacial cliff vary. At one point a flint was found in the head. 



Below a ruined cottage, 400 yards south of the last section, 

 the boulder-clay cuts out the head, and comes to rest on the rock- 

 platform, which is striated from W. 15° N. to S. 15° E. 

 About 80 yards to the south, the section in the cliffs is : — 



Feet. 

 Upper head, . . . , . . 4 



Red boulder- clay, . . . . . . 6 



Lower head, . . . . . . . . 18 



Ferricrete sand . . . . . . 0-3 in. 



Rock-platform. 



