18 



MORAINES OF 



Upper 

 Oalleby. 



64 to 66. — Angular quartz and slaty and felspathic 



Table-case 7 



in Recess 41. &on. 



>/ 



>f 



67. — Angular slaty stone, well scratched, from moraine 



68.— Moraine mud, with small angular gravel, un- 



sifted, from moraine at the lower end of 



Lit/daw, 



Snowdon. This moraine partly lies upon the great roches 

 moutonnees that bound the lake, and it also partly dams 

 up the lake at its eflux. The roches moutonnees above 

 alluded to, are covered with erratic blocks, transported from 

 higher levels by the glacier. 



69 and 70. — Moraine mud, with small angular stones ; 



Llyn Llydaw, Snoivdon. 



71. — Angular stone, imperfectly smoothed and 



SCRATHED ; moraine, Llyn Llydaw. 



72. — Sandy mud, with angular stones (unsifted), 

 Glaslyn, Snowdon. This lake is at a higher level than Llyn 

 Llydaw, in the same valley. Both are surrounded by polished 

 grooved and scratched rocks, and patches of moraine matter. 

 Other lines and patches of moraine occur in Cwm Dyli, below 

 Llyn Llydaw, and the whole of this magnificent valley must 

 have formed one of the chief and highest sources of glacier 

 ice that helped to feed the great glacier of Llyn Gwynant. 



73. — Moraine mud and small angular felspathic 



slaty stones, in native proportion, from inner moraine, south 



Pennant 



Pass of 



74 



Angular and partly scratched felspathic 



slaty pebbles, same locality as above. 



This moraine is perhaps the most perfectly regular and 

 entire of any in Caernarvonshire. Its precise position is as 

 follows : — In the Pass of Llanberis, immediately above the 

 11th milestone, is the cottage of Blaen-y-Pennant. Nearly 

 a quarter of a mile due S. W. of the cottage is a large well- 

 rounded roche moutonnee of felspathic trap, partly weathered . 

 The moraine lies less than a quarter of a mile S.W. of the top 



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