Wright and Muff — Pre-glacial Raised Beach. 275 



the boulder-clay and the rock-ledge there is generally a thickness 

 of 1 to 2 feet of angular slaty rubble (head) . 



Clonakilty. — The rock-platform, overlaid by the terrace of drifts, 

 is seen on the east side of Clonakilty estuary. 



Excellent sections of the raised beach are to be seen in Clonakilty 

 Bay from near Simon's Cove to Donaghmore. For the whole of 

 this distance there is a smooth platform cut across the edges of the 

 highly inclined strata, and sloping gently seaward at angles vary- 

 ing from 3° to 10°, It is sometimes as much as 50 yards broad 

 from the foot of the drift-cliff to its seaward margin. The lower, 

 25 to 30 yards, is covered by high tides, and this portion of the 

 platform is being broken up by the action of the sea. The higher 

 portion of the platform at the foot of the drift-cliff presents an 

 undulating wave-worn surface. 



West of Simon's Cove, the base of the cliff is occupied by 

 2 to 3 feet of ferricrete gravel resting on the platform. The 

 gravel is well bedded, and composed of well rolled stones. Above 

 this, and not sharply marked off from it, there is a thick bed of 

 uncemented gravel. The stones are sub- angular or rounded ; and 

 though the material is bedded, it is not so well sorted as in the 

 cemented gravel below. The gravel becomes rather clayey, and 

 contains angular local debris near the top, and in some places 

 looks rather like stony boulder-clay, though no scratched stones 

 were found in it so far as it was accessible. It thus resembles a 

 glacial gravel ; and it is easy to understand that when it was 

 deposited upon the beach-gravel, the upper part of the latter 

 might be re-arranged and more or less incorporated in the former. 

 Another distinction to be noticed is that, although the materials 

 forming the pebbles are the same in both, the lower gravel con- 

 tains a larger proportion of vein-quartz and hard grit pebbles. 

 The greater wear to which the beach-gravel has been subjected 

 has resulted in the survival of a higher proportion of the harder 

 rocks. 



The upper gravel is overlaid by 2 to 6 feet of angular, slaty 

 rubble (upper head). 



Immediately east of Simon's Cove the platform is hummocky, 

 and overlaid by a variable thickness of head. A short distance 

 eastwards, gravel, and then boulder-clay, come in beneath the 

 upper head. 



