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| Keywords: The Quarterly journal of the Geological Society of London (12645008385).jpg 1848 MURCHISON ON THE STRUCTURE OF THE ALPS <br> 181 <br> Buch pointed out to me the clear determination of the Oxfordian <br> formation by the presence of several of the fossils above enumerated ; <br> and in the grand natural sections between Rovereto and the Corneto <br> pass I also perceived a fine succession under the Ammonitico rosso <br> The same Oxfordian zone has been delineated in Piedmont and <br> Savoy by M Sismonda In the environs of Chambery and Aix les <br> Bains I had the advantage of studying its relation to the superior or <br> cretaceous strata with the Canon Chamousset That geologist has <br> there divided the great Oxfordian masses into four parts the lowest <br> of which are marly limestones in beds of about a foot thick 2ndly <br> Limestones deep grey or bluish with white veins and some ferrugi- <br> nous oolite It is this band which contains most of the fossils inclu- <br> ding the Ammonites biplex c with Aptychi c 3rdly Foliated <br> marls or calcareous flags ; and 4thly Marly limestone c This <br> zone is overlaid by limestone with many corals which is paralleled <br> with the coral rag of English geologists and that again is conformably <br> overlaid by a full expanse of the neocomian formation which in this <br> region is divisible into three parts <br> Not describing all these strata I here merely annex a general sec- <br> tion from the base of the Oxfordian to the summit of the Neocomian <br> which I made on the western shore of the Lac de Bourget on <br> the sides of the zigzag road from Chambery to Lyons which tra- <br> verses the Montague du Chatf This Oxfordian group forms the <br> w <br> Fig 3 <br> Mt du Chat <br> Lake of <br> Bourget <br> Cretaceous <br> Upper Neocomian limestone with Chama ammonia <br> Middle Neocomian with Spatangus retusus <br> Lower Neocomian greenish ferruginous calc grit with Ostrece Pectens c <br> base of EngUsh Lower greensand <br> Coralline limestone Coral rag Summits dolomitic <br> Oxfordian Jura with Kelloway rock fossils 2 Schists and limestones <br> f 3 <br> Jurassic ' <br> base of all the outer edges of the Savoy Alps ; their summits usually <br> consisting of neocomian limestone and often covered by still younger <br> rocks This order is seen around Chambery and the lake of Bourget <br> at Annecy in the valley of the Arve both above and below Sallenches <br> and near Geneva <br> The Oxfordian limestones but without such a capping are co- <br> piously exhibited in the range of mountains east of Vevey At <br> Chatel St Denis where the limestone is very mottled and con- <br> cretionary it is loaded with ammonites and Aptychi ; and the same <br> rock subjected to great flexures rises into the high peak the Dent <br> t See Bull Geol Soc Fr new ser t i pi 9 fig 3 <br> X I was directed to these limestones by M Studer and M Collon of Vevey ac- <br> companied me thither 35268825 109512 51125 Page 181 Text v 5 http //www biodiversitylibrary org/page/35268825 1849 Geological Society of London NameFound Aix NameConfirmed Aix EOLID 104240 NameBankID 2474092 NameFound Ammonites biplex NameConfirmed Ammonites biplex NameFound Chama ammonia NameFound Spatangus retusus Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 5 1849 Geology Periodicals Smithsonian Libraries bhl page 35268825 dc identifier http //biodiversitylibrary org/page/35268825 smithsonian libraries Information field Flickr posted date ISOdate 2014-02-20 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/12645008385 2015-08-27 10 58 27 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1849 Photos uploaded from Flickr by Fæ using a script | ||||
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