MAKE A MEME View Large Image The Quarterly journal of the Geological Society of London (14075866545).jpg ROCKS OF PEMBEOKESHIEE <br> 543 <br> reality they are the rocks which form the cliffs for a considerable <br> distance along the east shores of that harbour This ...
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Keywords: The Quarterly journal of the Geological Society of London (14075866545).jpg ROCKS OF PEMBEOKESHIEE <br> 543 <br> reality they are the rocks which form the cliffs for a considerable <br> distance along the east shores of that harbour This same strange <br> mistake is evident also in his section as a most abnormal thickness <br> is given to the sandstones above the conglomerates to enable the <br> other beds to get into position It certainly is a curious fact that <br> the greatest exposure of Cambrian conglomerates in the neighbour- <br> hood of St David's should be thus missed as it evidently must have <br> been by the Director-Greneral This error of his furnishes the best <br> proof that could be desired of the great unconformity between the <br> Cambrian conglomerates and the Pebidian; for had the former con- <br> tinued to lie on the same beds of the latter as at Ehosson less than <br> a mile to the south where they are well exposed their position <br> would be a quarter of a mile to the east of Porth-seli as shown in Dr <br> Geikie's map The facts however as stated above prove that in this <br> mile of country a quarter of a mile in thickness of nearly vertical Pebi- <br> dian strata has been overlapped by the conglomerates The sketch <br> fig 15 shows the Cambrian conglomerates reposing upon the Pebidian <br> I'ig 15 ” Shetch of Cliffs on south side of Ogof-golchfa WTiitesand <br> Bay showing basal Cambrian Conglomerate 1 resting uncon- <br> formably on Pebidian rocks series e <br> Index as in Map PL XXIV <br> beds at Ogof-golehfa Whitesand Bay The conglomerates are of very <br> great thickness here the pebbles of large size and many of the frag- <br> ments are such as could only be derived from the Pebidian beds <br> below The large pebble exhibited by me at the meeting when the <br> second part of Prof Geikie's paper was read which was claimed by <br> Mr Peach to be a segregation came from these beds ; and 'Note 69 <br> will show that it is a large pebble of a schistose quartz-felsite <br> identical with the quartz-felsites of series c of the Pebidian The <br> conglomerates at Ogof-golchfa repose upon schistose felsitic tuffs <br> and breccias and some schistose argillites Notes 39 and 40 refer <br> to some of these rocks <br> Section fig 1 p 524 runs in a S E direction from the south <br> side of Porth-seli across the Pebidian rocks and the Dimetian <br> axis to the shore of St Bride's Bay below Nun's Chapel It <br> shows the usual series of Cambrian rocks in this area and the <br> Pebidian series as in the section to the south but with a greater <br> 2o2 36941376 113697 51125 Page 543 Text 40 http //www biodiversitylibrary org/page/36941376 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 36941376 dc identifier http //biodiversitylibrary org/page/36941376 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 N02/14075866545 2015-08-26 05 52 14 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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