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| Keywords: The Quarterly journal of the Geological Society of London (13205900435).jpg PITTON S SECTION AT ATHERFIELD <br> Fig 3 Fig 4 <br> mm <br> 291 <br> Black- Gang Chine <br> Whale and Walpen Chines <br> Vndercliffs ” The picturesque scenery at the back of the Isle of <br> Wight emphatically called the UndercliiF is a most striking ex- <br> ample of the structure or rather destruction produced by the alterna- <br> tion of solid or permeable strata with others more retentive of moist- <br> ure In the present section some cases occur of less prominence but <br> not undeserving of notice Looking eastward from the top of the <br> cliif near Atherfield towards Rocken End the strata are seen to rise <br> conformably at a very small angle of inclination ; but their uniformity <br> is broken by two or three less regular shelves and these upon exami- <br> nation are found to have been produced by certain retentive beds <br> among the looser strata The water thus kept up carries off a part <br> of the lower mass undermining that above ; and the result is the pro- <br> duction of a shelf or terrace between two ranges of cliffs one of them <br> supporting the Undercliff the second forming a remoter vertical <br> face behind <br> Six or seven of these minor undercliffs formerly existed on the <br> coast between Atherfield and Rocken End one of which near Ather- <br> field has now nearly disappeared The most remarkable of those <br> which remain is due to a group of clay and retentive sand in which <br> Captain Ibbetson was the first to discover several species of fossil <br> shells and which is for the greater part concealed by ruins of the <br> upper strata The underclifP upon this clay rises nearly at Walpen <br> Chine ascending westward and crossing Ladder and Whale Chines <br> Another marshy undercliff which comes down to the shore on the <br> east of Cliff-End has been produced by the fall of the white sand and <br> clay No 41 a small portion only of which is visible near Walpen <br> High-cliff and still other alternations of clay and sand in the beds <br> above have cooperated with the Gault in producing the fall of the <br> upper greensand by which enormous masses of that deposit have <br> been brought down even to the sea-side at Rocken End <br> Divisions of the Section <br> The whole series of deposits here consisting of sand and clay with <br> great uniformity of aspect the most obvious divisions might be derived <br> from their difference in mineral composition The list of strata which <br> I have adopted is therefore in some measure arbitrary and intended <br> chiefly to facihtate reference to this particular section ; and I cannot <br> too strongly caution my reader against supposing that similar sub- <br> divisions of groups which in a geological sense are the same are to <br> be expected in other places especially when the distances are great <br> It will presently be seen that within the Isle of Wight itself the <br> distant portions of continuous beds vary considerably in character 36933042 113687 51125 Page 291 Text v 3 http //www biodiversitylibrary org/page/36933042 1847 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 3 1847 Geology Periodicals Smithsonian Libraries bhl page 36933042 dc identifier http //biodiversitylibrary org/page/36933042 smithsonian libraries Information field Flickr posted date ISOdate 2014-03-17 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/13205900435 2015-08-26 12 56 17 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1847 Photos uploaded from Flickr by Fæ using a script | ||||
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