VALLÉE DE GWM-GLAS

Llyn Llydaw', Gwm-y-Uan*, Cwm-y-clog-wyn ', and Llyn dur Arddu *, in some of which Ihe sings of glacier ice are even mcrr striking than in the Pass of Llanberis itself.

Just above the turnpike-gate in the Pass , Cwm-glas-bach strike^ up lowards the top of Snowdon. The clifTs of Llechog' formeil «jî* felspalhic porphyry, boundt it on the west. A lower ridge separalc^ it from Cwm-glas on the east , and its upper end is formed of a rough semicircular sweep of beds of consoUdated felspalhic ashes The rocks at the upper end of the valley, oflen bare of végétation , were partly smooted by a glacier that descended from the snowi fA Crib-y-ddysgyl ®, and further down the felspalhic porphyry sc^l begins to show strong signs of glacial abrasion , which continue c J the way down to the Pass. Thèse surfaces , though decayed aoi roughened by âge, and weathering and splitting at the joints, arstill oflen wonderfully perfect in form. Distinct stricUions are, however, rare, but when they do occur, Ihey run norlh and norihnorth-east , that being the direction necessarily given to them by .< tributary glacier, that during this glacial period descended Ihe va]ley to swell the main mass of ice in the Pass. vdiée de cwm-giai. j{ 3^ gyt [i jg jn (j^q adjoiniug valley of Cwm-glas that some of ibe

erratique superbe, most perfcct remaiits of glacier action are to be found. First Ihere b

* Llydaw is the Welsh name of Annonça , but there seems to be no sease îa thb sterpretation. Lludw means ashes or ctmfers, and it is remarkable that on parts oft^ slopes round the lake, there are Consolidated Lower Silurian volcanic ashes, sUL ^ scoriaceous-looking that even a person who is no geologist might readily recoçntse il- i as volcanic.

* The Enclosed Valley.

» The Craggy Valley.

* Ardd means a garden, and this name has ollen been translated «the làkt ^''' black garden. > Such a name, however, seems to bave no sensé when taken io fcor^-^tion with thelocality. Arddu also means • the extrême of blackness,» and lying, ^s '^ pool does, in a deep hollow at the base of a tall black cliff, the name literally sàçr-î '- « the blackest black lake, > or, as it might be freely translated into Scotch, «Pit-ELi Loch. »

" The laminated or «flaggy cliff, > or précipice. The great beds of felspathk porp^r^» interbedded with slaty bands stand on end , and from below bave a lai^y laxziti r.^ aspect.

* « The Toothed Dish. » The upland valley bounded by this hill is one of tho«e c^ ~ dron-shaped hoUows that in ScoUand would be called a «Corry,» and the serraied t'ir' of its cliff may well be likened to teeth. « Crib-y-ddysgyl. • « Teeth of tbe Disb. •