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| Keywords: The Quarterly journal of the Geological Society of London (13204819044).jpg EEV A TRYING ON THE <br> CQ <br> ZQ <br> 2 Again it may well have hap- <br> pened that in some of these later <br> movements of the mountains lateral <br> thrusts may have acted vertically <br> or nearly so to older lines of valley <br> The effect of such forces would be <br> if the resultant force was not too <br> deeply seated to partly close in the <br> valleys upon which they were <br> brought to bear until the sides of <br> the valleys in their narrowest parts <br> came together leaving the wider <br> portions to form true rock-basins <br> which getting filled with water <br> from the surface-drainage would of <br> course form lakes The direction <br> of the principal lines of flexure of <br> the Jura chain affords a strong pre- <br> sumption in favour of the hypo- <br> thesis that in this way the valley of <br> the Rhone below Geneva may have <br> been partly closed in This alone <br> would account for so much of that <br> lake as lies in a true rock-basin <br> Part of its depth however it owes <br> to the delta of the Arve which has <br> been brought down from the Mont- <br> Blanc region <br> 3 There is a phenomenon f well <br> known to mining-engineers as a <br> creep In old coal-workings it <br> is found that the vertical pressure <br> of the superincumbent strata acting <br> upon the strata immediately below <br> the galleries where the coal-seams <br> have been removed causes the floor <br> of the mine to rise so as in time to <br> completely fill up the disused work- <br> ings Such a resolution of vertical <br> pressure is possible where more mas- <br> sive strata as often occurs in the <br> lake-regions of the Alps rest upon <br> strata of a more yielding nature on <br> opposite sides of a gorge-like valley <br> In such cases the erosion of the <br> valley being continued down to the <br> lower strata these being at the <br> Vide ' Les Causes actuelles en Gre'olo- <br> gie ' by Meunier pp 203 204 <br> t Vide Lyell ' Student's Elements ' p 56 36928655 113681 51125 Page 78 Text 39 http //www biodiversitylibrary org/page/36928655 1883 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 39 1883 Geology Periodicals Smithsonian Libraries bhl page 36928655 dc identifier http //biodiversitylibrary org/page/36928655 smithsonian libraries Information field Flickr posted date ISOdate 2014-03-16 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/13204819044 2015-08-26 13 53 27 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1883 Photos uploaded from Flickr by Fæ using a script | ||||
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