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| Keywords: The Quarterly journal of the Geological Society of London (12961033115).jpg 74 <br> PKOCEEDIlSrGS OP THE GEOLOGICAL SOCIETY <br> dation than can be obtained from natural sections in brooks where <br> the different gravels are moved and mixed up together by the recent <br> action of water The total thickness of the gravel is 18 feet <br> Fig 8 ” Section showing Coal-seams squeezed into drift during the <br> deposition of the lowest gravel on Hirwain Common ” Natural <br> scale <br> w <br> Bacon Hole Gower S Wales <br> Near this well-known cave limestone-gravel lies on a very steep <br> cliff of limestone in some places sloping as much as 70° to the sea <br> The top surface of this gravel lies at an angle of 34° ; and the <br> bottom fills up the concavity in the limestone rocks The path to <br> the cave passes over this gravel which is entirely composed of sharp <br> angular fragments of limestone cemented together by carbonate of <br> lime a process which seems to have been common in the Quaternary <br> period I noted on a previous occasion the manner in which lime- <br> stone-blocks had been observed by Mr Pengelly to be cemented <br> together near Torquay at a considerable height above the sea <br> The mass of limestone-gravel falling down this cliff accumu- <br> lating in concavities and sloping to the sea at an angle of 32° S <br> on the surface may be seen at a height of 120 feet above the sea <br> In its course from the high cliffs above it seems to have sent off a <br> vein of gravel at a point 70 feet above the sea to the east at an <br> angle of 11° <br> This vein of angular gravel thickens to the east and expands to a <br> thickness of 25 feet when it reaches the opening in the limestone <br> cliff called Bacon Hole a deep fissure penetrating a long distance <br> into the limestone cliff in a northerly direction and having a roof <br> with an acute angle which has often been described 36102919 111288 51125 Page 74 Text v 25 http //www biodiversitylibrary org/page/36102919 1869 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 25 1869 Geology Periodicals Smithsonian Libraries bhl page 36102919 dc identifier http //biodiversitylibrary org/page/36102919 smithsonian libraries Information field Flickr posted date ISOdate 2014-03-06 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/12961033115 2015-08-26 15 58 34 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1869 Photos uploaded from Flickr by Fæ using a script | ||||
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