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| Keywords: The Quarterly journal of the Geological Society of London (13860367334).jpg PROF C LAPWORTH OX THE GIRYAN SUCCESSION <br> bQ\ <br> limestone-yielding conditions for a time into the era of production <br> of the conglomerate itself These nodular beds succeed a patch <br> of calcareous shales Ab 4 representative of the Didymograptus- <br> beds which contain a few characteristic fossils principally Lingulidae <br> This zone is irregularly underlain by the compact and nodular <br> limestones which are exposed in a small side quarry and are <br> especially in their lower portions greatly contorted and shattered <br> The section is terminated below by a series of sandy grits probably <br> those of the lower zones of the O -confinis-beds They afforded me <br> no fossils but they present the hollows and seams of rottenstone <br> characteristic of the zone <br> In the succeeding runnels which cross the prolongation of the <br> limestone band to the eastward the calcareous and conglomeratic <br> groups are shown in a more or less shattered condition The Benan <br> Conglomerate Ac occupies the higher parts of the stream-courses <br> It is underlain in the natural order by patches of the limestone beds <br> which in their turn are supported by fragments of the under- <br> lying sandy gritstones The rapidity with which the higher zones <br> of the limestones part with their calcareous matter as we pass to <br> the eastward is most remarkable the whole of the upper beds <br> showing a tendency to degenerate into a group of nodular shales <br> 2 Craigwells or Brockloch Quarries ” After traversing a short <br> interval devoid of rock-exposures we again meet with the calcareous <br> band in a group of old limestone- quarries lying to the east of the <br> farmhouse of Brockloch <br> In the quarry situated at the disused limekiln of Craigwells we <br> have the following section fig 5 <br> Fig 5 ” Brockloch Quarry <br> N w S E <br> \ <br> Ac Benan Conglomerate <br> Abe Conglomerate with nodules <br> of lime <br> Ab 3 Compact Limestone 20 feet <br> Ab 2 Impure flaggy Limestones <br> Ab 1 Nodular Limestones <br> Aa 2 Calcareous Flagstone <br> To judge from this section it would appear at first sight that the <br> Compact Limestones Ab 3 are surmounted immediately by the basal <br> beds of the Benan Conglomerate Ac while the Didymograpttus-be s <br> Ab 4 are absent from the section having apparently been eroded <br> and that the overlying conglomerate rests unconformably upon an <br> undulated face of the Compact Limestone fragments of which occur 36936396 113692 51125 Page 567 Text 38 http //www biodiversitylibrary org/page/36936396 1882 Geological Society of London NameFound Didymograptus NameConfirmed Didymograptus EOLID 4724756 NameBankID 4143122 NameFound Lingulidae NameConfirmed Lingulidae EOLID 1524 NameBankID 2765652 Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 38 1882 Geology Periodicals Smithsonian Libraries bhl page 36936396 dc identifier http //biodiversitylibrary org/page/36936396 smithsonian libraries Information field Flickr posted date ISOdate 2014-04-15 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/13860367334 2015-08-26 07 57 28 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1882 Photos uploaded from Flickr by Fæ using a script | ||||
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