280 Scientific Proceedings, Royal Dublin Society. 



delicate slate fragments similar to those of the head lying along 

 the bedding planes. 



Myrtleville. — About 80 yards south of Myrtleville Cottage the 



beach is well seen in section normal to the coast-line : — 



Feet 

 Head, very slaty and gravelly in places, . . 10 



Sand, with some gravel and stones, . . 2-3 



Sandy gravel, with large blocks at end near 



old cliff .. .. .. -.1-2 



Rock-platform. 



The sand and sandy gravel are dovetailed into one another, and 

 much cemented with oxides of iron. The stratification dips seaward 

 on to the rock-platform at a low angle (see p. 260, and PI. XXVII.) . 

 The highest portion of the platform here seen is 5 to 10 yards from 

 the old cliff. It is 10 feet above the line of sea-growth, and 

 8 feet above the modern shingle at the head of the gully in which 

 the section is exposed. The platform slopes gently seaward, and 

 at its outer edge is 5§ feet above the same line of sea-growth. On 

 the south side of Myrtleville Bay blown sand can be seen beneath 

 the head in several places (see Plate XXVIII.) . 



On the north side of Myrtleville Bay, cliffs of boulder-clay 

 and head 30 to 40 feet high rest on a low-lying seaward portion of 

 the rock-platform, which stretches out below high- water mark, and 

 terminates in the rock known as Carrigabrochell. 



Going north, however, the platform rises again as the drift- 

 cliff approaches the pre-glacial shore, and half way between 

 Myrtleville and Poulnacallee reaches a height of 15 feet above the 

 line of sea-growth. At this point there is a 45-foot cliff of drift, 

 consisting of 10 feet more or less of boulder-elay on head, which in 

 turn rests on the water- worn rock-platform. Here, also, caves in 

 the head show blown sand resting immediately on the rock- 

 platform among large blocks, and also at a height of 35 to 40 feet 

 above it, banked against the rock-face. 



Just south of Poulnacallee Bay is the following section : — 



Feet. 

 Boulder-clay, . . . . . . 6 



Head, . . . . . . . . 30 



Blown sand, -j in patc hes of irregular thickness. 

 Beach -gravel, j 



Uneven rock-platform. 



