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| Keywords: The Quarterly journal of the Geological Society of London (14052746146).jpg ROCKS OF PEMBEOKESHIRE <br> 525 <br> this coast The latter however occur only at Pen-pleidiau Point <br> between Caerbwdy and Caerfai where they are tolerably fossilifcrous <br> In a cliff-section immediately to the S E of Nun's Chapel the Cam- <br> brian conglomerates may be seen resting unconformably on the edges <br> of the Pebidian rocks as is shown in figs 1 and 2 This section was <br> Fig 2 ” Section sliowing Camhrian Conglomerate resting on edge of <br> Pebidian beds in Cliff S E of Nwi's Chaj el <br> Cambrian <br> 2 Greenish sandstones <br> 1 Basal conglomerate <br> B Pebidian <br> F Fault <br> referred to by me in a previous paper as proving marked unconformity <br> in this area between Cambrian and Pebidian Dr Geikie however <br> has endeavoured to explain away this appearance by calling it a case of <br> ' contemporaneous erosion accompanying Cambrian conglomerates <br> Evidently on his theory of conformable succession this was a very <br> awkward case to deal with and the only alternative was to call it one <br> of contemporaneous erosion This section and some adjoining ones <br> when examined with care clearly show however that it is utterly <br> impossible to explain away the facts on any such hypothesis It is a <br> curious fact also that this section is stated in the explanatory text of <br> his paper and in that accompanying the figure itself to be in Caerfai <br> whilst it is in reality more than half a mile west of that creek and in <br> Nun's Chapel Bay The section as given in his paper at p 287 also is <br> clearly an imperfect representation of the conditions exhibited though <br> the unconformity can be recognized even there Though some of the <br> conglomerates have been dropped by a fault in this section it is <br> fortunate that it has only taken the upper beds and has left the lower <br> ones where they rest on the Pebidian beds undisturbed The <br> thickness lost by the fault has not been great as the majority of the <br> green sandstones forming the next series are present in the section <br> in a nearly vertical position <br> Quart Journ Geol Soc vol xxxix p 287 <br> Q J G S No 159 2u 36941358 113697 51125 Page 525 Text 40 http //www biodiversitylibrary org/page/36941358 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 36941358 dc identifier http //biodiversitylibrary org/page/36941358 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 N02/14052746146 2015-08-26 05 54 02 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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