Wright and Muff — P re-glacial Raised Beach. 287 



A little over 100 yards further on, large blocks with some 

 gravel rest on the platform, and blown sand is mixed with the 

 lower part of the head. The boulder-clay again comes down to 

 the platform 300 yards to the south. Here it contains a number 

 of well-rolled pebbles evidently derived from the pre-glacial beach. 

 Amongst them were two pebbles of distant origin, one being a 

 felsite of a type found amongst the Silurian Rocks of County 

 Waterford, and the other a micro-granite. 



Nearly 400 yards to the south, and just north of the Coast- 

 guard Station, boulder-clay, 9 feet thick, overlies loose bedded 

 blown sand, which is over 5 feet thick. 



Roche's Point to Power Head. — Blown sand, covered by lower 

 head, is banked against the pre-glacial cliff to the south of the 

 Coastguard Station, and again, below Roche's Tower, half a mile 

 east of the Lighthouse. A little gravel, overlain by head, is seen 

 resting on the rock-platform close by. 



The head may be followed into the bay at Trabolgan, where it 

 is overlain by stony red boulder-clay, 20 feet thick. The head is 

 composed of the local red sandstone and slate, but one broken 

 piece of chert, with' its edges rubbed, was found in it. The base 

 of the head here passes below high-water mark. About a foot and 

 a half of greenish, sandy loam was exposed on the shore below the 

 head by the removal of the beach during a storm. Some of the 

 beds of loam were pierced by vertical pipes filled with ferruginous 

 matter. They might have been rootlets. 



On the east side of the bay the rock -platform, 4 to 5 feet above 

 high- water mark, is covered with large blocks of rock, more or less 

 rounded, between which beach-gravel is packed. The gravel and 

 blocks are overlain by head, with traces of boulder-clay above it. 

 In one part of the section blown sand occurs above the beach- 

 gravel and blocks, and is mixed with the base of the head. 



The rock -platform, with either head or gravel lying on it, runs 

 round the eastern horn of the bay into the next one. On the western 

 side of this bay, and close to the pre-glacial cliff, the platform is 

 6 to 8 feet above high- water mark. The full succession of deposits 

 from the beach- gravel to the upper head is seen. A flint pebble 

 was found in the boulder-clay here. 



