4i8 



Submergence. 



moraine-matter of the Till, there are patches of sand 

 and clay interbedded. The main mass, indeed, is not 

 stratified, because glaciers rarely stratify their moraines, 

 but the waves playing upon them, as they were deposited 

 in the sea, arranged portions in a stratified manner ; 

 and there occur at intervals in these patches in Scot- 



Fm. 86. 



Pass of Llanberis. 



land the remains of sea-shells of species such as now 

 live in the far north. 



In the low grounds that border the estuaries and 

 alluvial plains of the Clyde, the Forth, the Endrick, 

 and elsewhere, up to^ 125 and 262 feet above the sea, 

 there are well known brick-clays which sometimes 

 contain erratic boulders and ice-scratched stones. Here 



