Notes on Glacial Deposits in Ireland. 



« 65 



limestone, and shells of some of the species last mentioned, a 

 few of them perfect, but only as single valves, is seen inter- 

 calated in the boulder gravels, with fine sands above and 

 below it. The boulder gravels contain huge fragments of 

 granite and Cambrian slate. Similar intercalations are seen 

 elsewhere. 



A little further on, at a bend of the road, a very remarkable 

 section is seen, as shown on accompanying sketch (fig. 2). 

 Immediately above the boulder clay are great blocks of 

 granite, ranging up to about two tons in weight. Clays and 

 sands succeed, and on their irregular surface lies a contorted 

 layer of characteristic red boulder clay, eight inches thick, 

 followed by pebble beds, sands, and clays in alternation. A 

 little further on the boulder clay underlying this layer of great 

 boulders is exposed for a depth of fifteen feet ; it is red in 

 colour, shell-fragments are common in it, as well as fragments 

 of Antrim chalk, and well striated Carboniferous limestone. 



Fig. 3. 



Apparent folding in the Glacial Drift, Bray River, near Enniskerry. 

 The crests of the folds point up the river valley. Length of section 

 about 15 feet. 



A few yards further on, in a cutting made for the proposed 

 Enniskerry railway, the section seen in figure 3 is observed ; 

 this appearance is remarkably suggestive of folding, though 

 the inclusion in the boulder gravels of lenticular masses of 



