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| Keywords: The Quarterly journal of the Geological Society of London (12711701523).jpg 412 PROCEEDINGS OF THE GEOLOGICAL SOCIETY Apr 4 <br> ous wooded mass the culminating points of which never exceed 3500 <br> EngUsh feet above the sea and whose main direction is from N W <br> to S E Its length from the environs of Eisenach on the N W to <br> those of Kronach on the S E is upwards of sixty miles and swelling <br> in width from a narrow apex on the N W it attains a maximum <br> width of about twenty miles in its S E portion <br> The south-eastern half of this tract is essentially distinct from the <br> north-western ; the first or wide part being made up of very ancient <br> sedimentary strata the second of crystalline rocks chiefly eruptive <br> and here and there of metamorphic character ; whilst the whole is <br> surrounded by a girdle of Permian rocks followed by lower mesozoic <br> deposits which delineate the dominant direction of the mountains <br> which they subtend <br> Fig 1 ” Diagram showing the General Succession of the Palaeozoic <br> Rocks in the ThUringerwald Horizontal distance about 12 miles <br> N W S E <br> 1 t tx <br> e Permian Rothe-todte-liegende Zechstein <br> and Sandschiefer <br> d Lower Carboniferous <br> c Upper Devonian <br> b Lower Silurian b Courses of limestone <br> a Bottom rocks <br> Lower Grauwacke or Cambrian and Silurian ” The most ancient <br> rocks as seen in the S Thiiringerwald consist of greenish talcose <br> schists traversed by white quartz veins and of ferruginous and <br> purple sandstone the latter much resembling certain rocks of the <br> Longmynd in Shropshire When examined in detail these rocks <br> marked a in the general diagram fig 1 exhibit towards the base <br> quartz rock and dark slaty schist the latter containing aluminiferous <br> schist These form the lowest courses as seen in several undu- <br> lations ; the upper and chief part being the greenish slaty rocks above <br> mentioned and in which whetstones occur In these rocks griine <br> grauwacke of Richter or Cambrian of the British Geological Sur- <br> vey which have all been affected by a slaty cleavage no other organic <br> remains except Fucoids Phycodes circinatus have been found <br> These fundamental rocks « exhibited in masses of great dimen- <br> sions and attaining in the Oberland of Meiningen elevations of up- <br> wards of 3000 feet above the sea are covered conformably by the <br> deposits which M Richter termed grey grauwacke an extensive and <br> diversified group 6 of slate and sandstone with some courses of alumi- <br> niferous schist graue grauwacke dach-schiefer griff el-schiefer c <br> the whole of which is referable through its fossils to the Lower Silu- <br> rian rocks The section fig 1 merely represents the general suc- <br> cession But from the observations of M Richter we believe that <br> this fossiliferous Lower Silurian consists in its inferior portion of <br> roofing-slates and coarse grits almost conglomerates subordinate to 35615000 110213 51125 Page 412 Text v 11 http //www biodiversitylibrary org/page/35615000 1855 Geological Society of London NameFound Phycodes circinatus NameConfirmed Phycodes circinatum NameBankID 6240544 Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 11 1855 Geology Periodicals Smithsonian Libraries bhl page 35615000 dc identifier http //biodiversitylibrary org/page/35615000 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 N02/12711701523 2015-08-26 20 52 39 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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