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| Keywords: The Quarterly journal of the Geological Society of London (12961051745).jpg TYLOE QUATEENAKY GEAVELS <br> 83 <br> at the present time ; but the physical conditions under which a <br> gravel- deposit like that at Sangatte could occur do not exist at the <br> present time in France It would require the rainfall of a pluvial <br> period to furnish the fresh water to lay down such a thickness of gravel <br> as that of Sangatte in such a position on the sea-coast <br> Thames-Valley Geavels <br> The section from the surface of the Thanet Sands 86 feet above the <br> Ordnance datum-line to the river Thames through the celebrated Cy- <br> rena-pits PI IV fig 6 is drawn to an exaggerated scale of heights <br> in proportion to lengths through the points A E I approximately <br> laid down on the map PI IX PI VII is a copy of part of the <br> Ordnance Parish Map of Grrays reduced to half size <br> An excavation into the chalk between B and C offers an opportu- <br> nity of observing the Thanet Sands quite undisturbed at a distance <br> from the surface of 27 ft at C and of 35 ft at B ; the dip of the <br> chalk is there slightly south the thin covering of gravel e dipping <br> south There is no opportunity of examining the structure of the <br> ground between C and D as it is not excavated ; but I expect the <br> section resembles that at Crayford on the opposite side of the river <br> Fig 16 is a transverse section near the point D showing about <br> w <br> Fig 16 ” Section at Grays Essex <br> D50 <br> E <br> e Covering gravel <br> d False-bedded muds 18 feet thick <br> d' 4-feet pebble-bed with shells Cyrena <br> c <br> c' Elephant-bed <br> c Cyrena-heA 1 foot thick <br> e Mottled clays with Cypris living now in <br> the Thames and impressions of plants <br> 10 feet <br> 18 ft of yellow false-bedded sands d under the covering gravel e <br> and lying upon the 4-feet pebble -bed composed principally of peb- <br> bles from the Woolwich beds of the Eocene series The Cyrena is <br> abundant in the sand of this pebble-bed and occurs associated with <br> other shells in the shell-beds below at c which are from 1 to 4 ft <br> in thickness varying much in character but dipping north to the <br> t 2 36102928 111288 51125 Page 83 Text v 25 http //www biodiversitylibrary org/page/36102928 1869 Geological Society of London NameFound Cypris NameConfirmed Cypris EOLID 14512 NameBankID 2698202 NameFound Cyrena NameConfirmed Cyrena EOLID 4757476 NameBankID 4134596 Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 25 1869 Geology Periodicals Smithsonian Libraries bhl page 36102928 dc identifier http //biodiversitylibrary org/page/36102928 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 N02/12961051745 2015-08-26 15 58 09 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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