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| Keywords: The Quarterly journal of the Geological Society of London (13204857183).jpg that <br> the relative positions of the two rocks cannot be accounted for by <br> faulting f At Porth-clais the actual terminal curve of the granite <br> projection can be traced across the bed of grit through which it has <br> risen fig 4 These junctions are characteristically those of an <br> eruptive mass <br> But the most important junction of the granite and Cambrian <br> beds is that which has been cut by the sea in the range of cliffs <br> between Porth-lisky and Porth-clais at the little inlet of Ogof- <br> llesugn fig 6 The granite which extends continuously eastward <br> from Porth-lisky abruptly ends off and is succeeded at once by <br> vertical sandstones and shales which are truncated by it nearly at <br> a right angle On the seaward face of the cliff the granite has <br> Quart Journ Geol Soc vol xxxiii p 231 1877 <br> t That there may have been some local slipping along the boundary-line <br> between the granite and the rocks it has invaded is not unlikely In the Allan <br> valley the faults would need to be reversed ones and to wind about so as <br> precisely to counterfeit the boundary-line of an eruptive rock This subject is <br> further referred to in Part II p 310 <br> \ This locality is referred to by Dr Hicks as a line of fault ; indeed in his <br> map Quart Journ Geol Soc vol xxxi pi viii as already stated he makes <br> the boundary -line between the two rocks everywhere a fault I have admitted <br> that along the flanks of the granite occasional local slips may have taken place ; <br> but the visible sections prove that no continuous or important faults occur <br> there Possibly some slight displacement may have taken place at Ogof-llesugn ; <br> but the mass of conglomerate is imbedded in the granite It should be noted <br> here that the section described in the text is the same as that already referred <br> to in the citation from Sir A 0 Ramsay's early MS report as affording the best <br> evidence of the intrusive nature of the igneous rock <br> Q J G S No 155 y 36928876 113681 51125 Page 277 Text 39 http //www biodiversitylibrary org/page/36928876 1883 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 39 1883 Geology Periodicals Smithsonian Libraries bhl page 36928876 dc identifier http //biodiversitylibrary org/page/36928876 smithsonian libraries Information field Flickr posted date ISOdate 2014-03-16 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/13204857183 2015-08-26 13 50 50 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1883 Photos uploaded from Flickr by Fæ using a script | ||||
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