408 Glaciation of Anglesea. 



of which, were the cliffy cirques on the western flanks 

 of Carnedd Llewelyn and Carnedd Dafydd, which, with 

 Y-Foel-fras, formed one great nursery of the glaciers of 

 Caernarvonshire, sending off ice-flows eastward to Capel 

 Curig and the valley of the Conwy, and westward to 

 where Bangor now stands and the Lavan sands. 



None of these glaciers, at a certain epoch, quite 

 reached the region now occupied by the Menai Straits, 

 but escaping from the higher bounding-walls of their 

 valleys, they spread out in the shape of broad fans on the 

 north-western slopes of the minor hills that now over- 

 look the Straits. This is partly proved by the northerly 

 curve of the glacial striations at the mouth of the Pass 

 of Llanberis, on the flatter area above the steep slopes 

 of the slate-quarries by Llyn Peris and Llyn Padarn. 



If, as I believe, these glacier masses did not cross 

 the Straits into Anglesea, we must look for some other 

 cause for the production of the north-east and south- 

 west striations which mark the whole of that broad 

 region. 



These striations point directly towards the moun- 

 tains of Cumberland, a country which, lying further 

 north, was at one time buried so deeply under snow 

 and ice, that almost all its mountains look simply like 

 gigantic roches moutonnees. From Cumberland, as 

 already stated, a vast mass of ice flowed southward ; 

 and reinforced by the ice-streams that came from the 

 mountains of Carrick in the south of Scotland, and 

 from the basin of the Clyde, it overspread the region 

 now occupied by the shallow sea of Morecambe, Lan- 

 caster, and Liverpool bays, that lie between Cumberland 

 and Anglesea, nowhere more than 30 fathoms deep. 



In its onward course, this mighty glacier buried all 

 the hills and rounded knolls of Great Ormes Head, Little 

 Ormes Head, and Diganwy, which are still on a large 



