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| Keywords: The Quarterly journal of the Geological Society of London (13204626005).jpg J S GARDNER ON THE LOWER LONDON TERTIARIES <br> 201 <br> Dover Kailway and appears to be light- <br> coloured sea-sand with considerable cohe- <br> sion about 60 feet thick and destitute of <br> fossils The few localities in East Kent <br> described by Prestwich and the Survey in <br> which fossils have been found do not seem <br> to differ in any important respect from the <br> section at Heme Bay and Pegwell Bay and <br> need not therefore be further alluded to <br> here The fossiliferous divisions of the <br> formation can in fact be perfectly studied <br> along the coast which presents by far the <br> most perfect and accessible as well as the <br> most typical sections fig 2 <br> The Herne-Bay section terminates at the <br> Beculvers and as restricted by Prestwich <br> and the Survey only exposes some 20 feet <br> of Thanet Beds ” Pegwell Bay however for- <br> tunately supplying a continuous section <br> through the remaining thickness to the <br> Chalk fig 5 The position of the lowest <br> Beculver bed can be accurately determined <br> palaeontologically in the Pegwell section ; <br> but to make it quite certain the measure <br> of its exact height above the Chalk which <br> is about 70 feet is given in a well sunk at <br> Reculver <br> The Thanet Beds rest conformably as it <br> is called on the Chalk at Pegwell Bay <br> with at first a dip of about 5° S <br> The base rests on a great tabular layer of <br> flint and is full of the usual unworn green- <br> coated flints It is now generally recognized <br> that these flints have been dissolved out of <br> the Chalk by solvent action like that which <br> produced the piping in chalk subsequent to <br> its upheaval f ; and the present upper surface <br> of the Chalk is therefore not actually the <br> same as that on which the first Eocene mud <br> Even the highest Chalk must have been greatly <br> denuded as it could hardly have risen to the surface <br> before it was compressed into a solid rock without <br> being covered with something capable of resisting <br> wave-action There is at least no instance of any <br> such deposit having been preserved as a surface <br> deposit in any Atlantic isles that have been up- <br> heaved The Thanet Sands are as little conform- <br> able and had as little to do with the Chalk as the <br> Goodwin Sands <br> t Whitaker Quart Journ Geol Soc I c pp <br> 406 407 <br> l <br> V rill' <br> bd i - <br> <br> 5 8 <br> to <br> i <br> o <br> N <br> CD <br> B <br> 1 <br> g 36928794 113681 51125 Page 201 Text 39 http //www biodiversitylibrary org/page/36928794 1883 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 39 1883 Geology Periodicals Smithsonian Libraries bhl page 36928794 dc identifier http //biodiversitylibrary org/page/36928794 smithsonian libraries Information field Flickr posted date ISOdate 2014-03-16 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/13204626005 2015-08-26 13 55 49 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1883 Photos uploaded from Flickr by Fæ using a script | ||||
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