288 Scientific Proceedings, Royal Dublin Society. 



Just east of Cotter's Point the section in the cliff is as follows : — 



Feet. 



Head, with a few pebbles, . . 6 



Angular slaty head, . . . . . . 12 



Well-rounded gravel, . . . . 3 



Bock-platform. 



The head with pebbles is probably upper head. 

 A third of a mile west of Gyleen, the head is 25 to 30 feet 

 thick, and overlies 6 feet of gravel, which rests on the smoothed 

 platform. 



The pre-glacial cliff along this portion of the coast is from 100 

 to 150 feet high. 



East of Gyleen the rock-platform is 5 to 6 feet above high- 

 water mark, and is overlaid by head about 20 feet thick. In 

 Powerhead Bay, half a mile east of Gyleen, the platform rises 

 locally to 15 feet above the modern beach, whilst the pre-glacial 

 cliff is only 20 to 25 feet high. On the east side of the Bay, the 

 following section is seen about 300 yards south of the strand : — 



Feet. 

 Head, . . . . . . 4 



Bedded gravel and sand, . . 4 



Sharp sand, . . . . . . 1 



Boulder-gravel, with sandy matrix, . . 3 



Smoothed, but uneven, platform. 



On the more exposed parts of the coast round Power Head, 

 the platform and the overlying drifts have been removed by recent 

 marine erosion, but a little rubble is generally found lying on the 

 rounded slope of the pre-glacial cliff. At one place a coating of 

 rubble-drift, 30 feet in height, but only 5 or 6 feet thick, is left 

 banked against the pre-glacial cliff, and resting on a narrow 

 remnant of the rock-platform. 



Ballycroneen Bay. — At the western end of Ballycroneen Bay, 

 the platform, together with the terrace of drifts, has been almost 

 entirely eroded away. It is, however, seen in the same bay, 

 1^ miles east of Power Head, where a little gravel with large 

 blocks, somewhat rounded, is overlain by head, and lies on the 

 platform about 5 feet above high-water mark. 



