296 



Scientific Proceedings, Royal Dublin Society. 



The higher portions of the platform seen at this point are 

 8 to 12 feet above ordinary high-water mark. 



The platform, although much eroded, is traceable 200 yards or 

 so further east, beyond which are the cliffs of Ballyvoyle Head. 



Ballyvoyle Head is the easterly extremity of the main mass of 

 the Old Red Sandstone rocks on the south coast; and from this to 

 Tramore, the cliffs are composed of sedimentary and igneous rocks 

 of Silurian age. These have yielded much more easily to the 

 action of the sea than the Old Bed Sandstone to the west, and 

 considerable erosion has been effected since the Glacial Period. In 

 consequence, no traces of the beach have been found, although 



,*?-A?f // */Hr WB.U 



Fig. 3. — View looking west from Stradbally Cove, showing rounded feature by 

 which the pre-glacial shore-line maybe traced even where the beach 

 has been removed by the sea. 



search was made in several places, and long stretches of the coast 

 examined. That it once existed here there can, however, be little 

 doubt, as the perpendicular post-glacial cliffs are often seen to 

 truncate the old rounded slope, so characteristic of the areas in 

 which the beach is to be found. This slope can often be seen to 

 be continued on a stack some distance out to sea, as in fig. 3. 



Ballymadder Point, County Wexford. — The raised-beach plat- 

 form, and its accompanying deposits, are well developed along a 

 stretch of coast a mile and a half long at Ballymadder Point, 



