OF WALES. 



15 



11 the hi ' 



'gin 



I 



lit 1)( 



now 



to 



as partly 

 i above tW 



the ghfl* 



aciers 



ivere 



ea 



ach valley 



the mo 



utbs 



bun 



d cro^' 



the or) 



;<!•# 



ary 

 ing 



stream 



the » f 



■cults 





1 **" 



if 



four perfect moraine mounds on the west side of Cwm Idwal, tjppeb 



or in the moraine of Cwm Llafar, below Carnedd Llewelyn, 



or in the upper part of Cwm Brwynog, and in Cwm Glas, iJ^SS. 



on the sides of Snowdon. Near the mouth of the last, not 



far above the bottom of the Pass of Llanberis, there are 



three concentric elliptical moraine heaps, touching each 



other ; and further up the valley, beyond the great roche 



moutonnee that lies half a mile south of Blaen-y-Pennant, 



an g^es toth 



bat mig 



of the whole 

 ed onward to 



t necessarily there is a perfect British terminal moraine, forming across 



ir the centre the valley a long curved ridge of clay, sand, and moraine 



of Llanberis stones and boulders, some of them well scratched. Other 



1 running in cases of equal value could be cited, showing a gradual 



of 1,300 feet retreat of the glaciers, till at length we find only the last 



ransverseto symptoms of the ice in the relics of tiny moraines far up 



hcse passes ; 

 the glacier?, 

 of Llanberis 

 then, as tk 

 d feet above 

 t and ice 



amid the innermost recesses of the mountains. 



Allusion has been made to British rochcs moutonnees. 

 These, when perfect, are rounded bosses of rock, polished 

 by the sanded bottoms of the glaciers, and of all sizes. 

 Some are only a few yards in diameter, others rather 

 deserve the name of polished hills than of bosses. In all 

 the British regions where glaciers existed they may be 

 plentifully found, and in Wales they may be counted by the 

 hundred. Perfect examples occur by the lake in Cwm 

 Orthin, near Ffestiniog, in the tributary valleys above the 

 river Llugwy, in Nant Francon above the Penrhyn slate 

 quarries, on the slopes below Llyn Idwal, by the bridge 

 I it hapP^ above the waterfall, and on the shores of Llyn Paclarn 



and Llyn Peris; and further up the pass, some of large 

 dimensions, plentifully sprinkled with great blocks of 

 stone {blocs perches), amaze the passing tourist, who often 

 wonders how masses rolled from the neighbouring moun- 

 tains have been arrested on precarious points, from whence 

 they would naturally have made a final bound into the 

 lower depths of the valley, while the experienced glacialist 

 at once divines that they were gently deposited where they 

 lie by the thawing of the glacier that bore them from the 

 higher recesses of the mountains. 



