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| Keywords: The Quarterly journal of the Geological Society of London (12684806254).jpg RAMSAY DRIFT AND GLACIERS OF N WALES <br> 375 <br> Fig 1 Diagram illustrative of the damming up of lakes by means <br> of moraines as in the case of Llyn Idwal and of the relation <br> of the Drift to the subsequent Glacier-conditions <br> ˘ S <br> Silurian Rocks <br> 1 Moraine forming the dam of the lake <br> 2 Grooved and polished surfaces formed by more ancient glaciers <br> 3 Pleistocene drift at an elevation of 2300 feet <br> There are other cases as in Cwm Graianog Nant Francon see <br> fig 2 where the drainage immediately percolating the loose piles of <br> stones no pent-up water is found within the barrier <br> Fig 2 Cwm Graianog Nant Francon having a terminal moraine <br> of loose stones which admits of the drainage of the valley <br> But these moraines are often at a lower level than much of the <br> Pleistocene drift as in the case of Llyn Idwal where the level of the <br> lake is about 1000 feet beneath the level of the ordinary drift on the <br> summit of the cliffs which I have already stated is in a high isolated <br> valley open at both ends see p 372 It is without tributary valleys <br> and the small rivulet which gradually gathers in its hollow and flows <br> into the Pass of Llanberis has rarely succeeded in cutting through <br> the drift of the higher ground to the solid rock beneath It is im- 35461443 109911 51125 Page 375 Text v 8 http //www biodiversitylibrary org/page/35461443 1852 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 8 1852 Geology Periodicals Smithsonian Libraries bhl page 35461443 dc identifier http //biodiversitylibrary org/page/35461443 smithsonian libraries Information field Flickr posted date ISOdate 2014-02-21 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/12684806254 2015-08-27 12 53 53 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1852 Photos uploaded from Flickr by FĂŚ using a script | ||||
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