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| Keywords: The Quarterly journal of the Geological Society of London (13889239499).jpg ROCKS or PEMBROKESHIRE <br> 537 <br> has caused the errors to be committed here as in the other areas <br> referred to Moreover Dr Geikie's statements tend to show that <br> the examination here of the actual facts must have been im- <br> perfectly carried out ; for the most important point of contact of <br> the Cambrian with the Dimetian shown in fig 10 is not even <br> referred to <br> Fig 10 ” Section slioiving contact of Cambrian with Dimetian in <br> Cliff at Ogof-Uesugn <br> Diabase dyke F Cave <br> Cambrian <br> When the Director-General read his paper even minor faults were <br> condemned by him In a footnote inserted after the discussion it <br> is stated however p 277 that possibly some slight displacement <br> may have taken place at Ogof-llesugn ; but the mass of con- <br> glomerates is imbedded in the granite This does not very much <br> improve the statement in the text on the same page that the <br> granite which extends continuously eastward from Porth-lisky <br> abruptly ends off and is succeeded at once by vertical sandstones and <br> shales which are truncated by it nearly at a right angle The <br> point where the conglomerates and sandstones touch the Dimetian <br> and according to the Director-General are truncated by it is shown <br> in fig 10 and I believe that those who have examined the spot and <br> they are now many will admit that this sketch gives a fair repre- <br> sentation of the Qonditions to be seen It shows the Dimetian to be <br> sharply defined with some beds of the Cambrian conglomerate lying <br> against it The line of fault is clearly indicated by fault-breccia <br> above and by a narrow cavern below into which some of the younger <br> members of Prof Hughes's party were able to squeeze themselves <br> for several yards As much higher beds of the Cambrian series <br> than these are found directly to the north to strike up against the <br> Dimetian it is clear that these beds are bounded at Ogof-llesugn <br> by two faults as shown on the map PI XXIY These probably <br> are some of the lowest Cambrian conglomerates and they may have 36941370 113697 51125 Page 537 Text 40 http //www biodiversitylibrary org/page/36941370 1884 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 40 1884 Geology Periodicals Smithsonian Libraries bhl page 36941370 dc identifier http //biodiversitylibrary org/page/36941370 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 N02/13889239499 2015-08-26 05 53 11 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1884 Photos uploaded from Flickr by Fæ using a script | ||||
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