276 Scientific Proceedings, Royal Dublin Society. 



The following section was obtained here : — 



Feet. 



Upper head, with clayey matrix, . . 6 



Yellowish- grey boulder-clay, with scratched 

 stones, . . . . . . . . 3-5 



Rolled gravel, . . . . . . 3-4 



Platform. 



The gravel contains large sub-angular blocks of local rock up 

 to 8 feet long ; and also near its base, a few slabs of slate usually 

 less than 2 feet long. 



Further eastwards, a hard grit band in the slates runs 

 obliquely from the cliff across the platform, above the general 

 level of which it projects in a series of rounded hummocks. 

 The pre-glacial cliff is exposed for a short distance ; and for 

 about 4 feet up from its base it presents the same smoothed, 

 wave-worn surface that is seen on the platform. The inner angle 

 of the platform, where it is rounded off into the cliff, is only 

 3 to 4 feet above the upper limit of growth of Balanus and Fucus, 

 which is here close to high- water mark. The gravel is banked 

 against the cliff to a height of 12 feet above the platform, and is 

 covered by head. One or two large blocks were observed in the 

 gravel at the base of the cliff. 



From this point the platform, with the gravel resting on it, 

 may be traced almost continuously for half a mile to the east. 



About 300 yards east of Simon's Cove a striking effect is 

 produced by the ferricrete sands of the beach bridging over a 

 gully which has been cut in recent times into the pre-glacial 

 platform. The following section is visible at this point : — 



Feet. 

 Head, with sand and angular blocks towards 



base, . . . . . . . . 6-7 



Gravel and sand, with blocks of rock, , . . 15 

 Ferricrete gravel, . . . . . . 3-4 



Smoothed rock-platform. 



The base of the ferricrete gravel is 5 to 6 feet above the upper 

 growth limit of Fucus and Balanus, and is estimated to be 

 18 to 19 feet above ordinary low tide, which ocourred at the 

 time the section was visited. The uncemented gravel- and-sand 

 contains many large blocks of rock, especially near the base. 



