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| Keywords: The Quarterly journal of the Geological Society of London (13889191727).jpg TOLCANIC GROUP OF ST DAVID S <br> 299 <br> Pig 4 View of Carn-ar-wig from the north <br> E w <br> Schistose Stratified Conglome- <br> ash ash rate <br> Agglomerate G-reen ash <br> Of these the rocky inlet of Ogof-Llesugn is doubtless the key ; it <br> has been brought forward as a crucial test of the true relations of <br> the two series of rocks and held to prove the idea of a Pre-Cambrian <br> granite to be a delusion This being the case it ought to be <br> described with care I am at a loss how to characterize the de- <br> scription that has actually been given of it without oiFence ; but I <br> must at least say that the essential feature has been missed A plan <br> of the spot is presented below fig 5 On the west side of the inlet <br> we have the granite mass on the east side the nearly vertical beds <br> of the Cambrian some way above the base striking straight at the <br> granite In the angle between these is a projecting mass of con- <br> glomerate also apparently vertical and striking nearly at right <br> angles to the other Cambrian beds so far as can be ascertained the <br> stratification being obscure This projecting mass is bounded on <br> either side by a fault which has given rise to a cavern ; that on the <br> east side between the conglomerates and the slates extends f mile <br> inland or to about the position of the Porthclais mill ; both are <br> characterized by their fissure-like straight aspect their slickensides <br> and the discordance of the adjacent beds There is some bending <br> round of the slates near the fault as if to get into the same strike <br> as the conglomerate which contains some tuff-like masses but is <br> unaltered from its usual appearance on this side On the western <br> side where the granite is the line of fault has been invaded by a 36941092 113697 51125 Page 299 Text 40 http //www biodiversitylibrary org/page/36941092 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 36941092 dc identifier http //biodiversitylibrary org/page/36941092 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 N02/13889191727 2015-08-26 05 55 31 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1884 Photos uploaded from Flickr by FĂŚ using a script | ||||
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