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| Keywords: The Quarterly journal of the Geological Society of London (12711461403).jpg 18 PROCEEDINGS OF THE GEOLOGICAL SOCIETY NoV 15 <br> peculiarities of interest ; it exhibits the junction of two beds of gypsum <br> of very different characters separated by an irregular waving line <br> which is on the whole vertical striking E The southern portion is <br> traversed by well-marked planes of cleavage dipping S 70° along <br> which are small folia of talc giving the mass a grey colour The <br> northera bed is a pure white gypsum quite free from cleavage ; the <br> annexed woodcut fig 1 will give a rough idea of this arrangement <br> Fig 1 <br> S 1/ <br> A / <br> / Y / \ <br> / -'1 / / <br> 1 1 I <br> Talcose Gypsum Pure white Gypsum <br> It appears from these sections that there are two deposits of gypsum <br> of very different ages in the valley of Chamoanix ; the earlier one <br> laminated the later deposited after the lamination of the rocks was <br> completed In both these cases the detritus concealed the base of <br> the gypsum <br> The lower part of the valley of Chamounix is so much filled up <br> by detritus that I despaired of finding anywhere the central axis of <br> the valley exposed ; but since my return I observe that Saussure <br> mentions at § 656 that at Blaitiere to the east of the village of <br> Chamounix the foliation of the crystalline schists is nearly hori- <br> zontal striking N E from which spot the inclination gradually in- <br> creased as he ascended towards Mont Blanc This observation bears <br> out what I had inferred that the foliation of Mont Blanc and the <br> Aiguilles Rouges forms together a complete arch the crown of which <br> runs down the valley of Chamounix <br> In Section No 5 PI I I have given a rough sketch of the posi- <br> tion of the bedding and cleavage of the rocks seen in crossing the Col <br> du Bonhomme from Nant Bourant to Chapieux The Bonhomme is <br> exactly on the southern prolongation of the western line of vertical <br> foliation of Mont Blanc The section is a most interesting one and <br> worthy of more time than I devoted to it ; but as M Favre is engaged 35614576 110213 51125 Page 18 Text v 11 http //www biodiversitylibrary org/page/35614576 1855 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 11 1855 Geology Periodicals Smithsonian Libraries bhl page 35614576 dc identifier http //biodiversitylibrary org/page/35614576 smithsonian libraries Information field Flickr posted date ISOdate 2014-02-23 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/12711461403 2015-08-26 20 56 29 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1855 Photos uploaded from Flickr by Fæ using a script | ||||
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