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| Keywords: The Quarterly journal of the Geological Society of London (13889855449).jpg LYDENBFKG AlfD DE KAAP TRANSVAAL SOUTH AiTRTCA <br> 571 <br> the loNTer ground of the head of <br> the valley it rises into hills and <br> ridges some of which have a con- <br> siderable elevation In some cases <br> it has weathered into bare round- <br> ed bosses bearing a striking re- <br> semblance to rocJies moutonnees ; <br> but over the greater part of the <br> area the surface of the granite is <br> decomposed into a soft brown <br> substance very much like an allu- <br> vial loam <br> In the Kaap Yalley the surface <br> of the granite forms an ellipse <br> about 17 miles in length by 10 <br> miles in width with a narrower <br> prolongation in a northerly direc- <br> tion It widens out again towards <br> the Krokodil E iver beyond which <br> it passes in under a series of rocks <br> which rest unconformably upon <br> those with which it has thus far <br> been in contact and which will <br> probably be found to occupy the <br> remainder of the Kaap Yalley <br> This mass of granite represents <br> a great centre of plutonic up- <br> heaval of course posterior to the <br> period of the Kaap -valley rocks <br> which it has greatly tilted all <br> around its margin ; it was how- <br> ever anterior to the deposition of <br> the rocks of the overlying uncon- <br> formable formation as they are <br> still nearly horizontal <br> 3 Silurian' Rocks ” jN'early all <br> around the granite centre is a <br> series of rocks which have been <br> tilted by it into a more or less <br> vertical position These rocks are <br> siliceous and argillaceous rarely <br> and then but slightly calca- <br> reous being mainly schists shales <br> cherts and quartzites I believe <br> them to be Silurian rocks ; <br> but with the exception of an <br> unreliable report of Graptolites <br> having been observed there has <br> been hitherto so far as I am aware <br> a total absence of fossil evidence 37047451 114009 51125 Page 571 Text 41 http //www biodiversitylibrary org/page/37047451 1885 Geological Society of London NameFound Graptolites NameConfirmed Graptolites NameBankID 423327 Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 41 1885 Geology Periodicals Smithsonian Libraries bhl page 37047451 dc identifier http //biodiversitylibrary org/page/37047451 smithsonian libraries Information field Flickr posted date ISOdate 2014-04-30 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/13889855449 2015-08-26 04 52 20 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1885 Photos uploaded from Flickr by Fæ using a script | ||||
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