THE EARTH'S SURFACE SEA ACTION. 45 



to 234 feet at Corker; from which they lower by 

 degrees to the " Blind Sound ; " but north-west of 

 this, at Dun Aengus, there is an ordnance height of 

 265 feet, and they attain their greatest altitude (300 

 feet) about a mile farther north-west, a little south- 

 east of Polladoo. From Doocaher towards the south- 

 east, to the point called Illaunanaur, there are sea- 

 terraced cliffs (excepting a few short breaks), which 

 are surmounted by a rampart formed of large blocks. 

 This latter is called by Professor King, Galway, 

 " The Block Beach." 



The cliffs on the west of this island are peculiar, 

 as in places they are terraced by the waves of the 

 Atlantic. Moreover, some of them are surmounted 

 by the " block beach." This peculiar accumulation 

 of blocks does not occur at all on the north-east 

 shore, while to the north-west it was only found at 

 the point due east of the north point of the Brannock 

 Islands. On Inish-Eeragh, the westernmost of the 

 Brannock Islands, there is also a block beach which 

 is thus described by Captain Bedford : " On all but 

 the eastern side there is a margin of massive blocks 

 of limestone, upheaved by the violence of the sea, and 

 which now form a sort of barrier against its farther 



encroachment The highest part of 



the island is the summit of the upheaved beach 

 at the north-west side, which is 36 feet above the 

 mean level of the sea." 



