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| Keywords: The Quarterly journal of the Geological Society of London (13071276964).jpg 110 <br> PEOCEEDINGS OF THE GEOLOGICAL SOCIETY Jan 23 <br> The following communications were read ” <br> 1 On the OccTTEREiTCE o/ CoN soLiDATED Blocks in the Drift of <br> Suffolk By Geoege Maw Esq F L S F G S c <br> As a contribution to the evidence on the geological position of the <br> blocks of saccharoid sandstone scattered on the surface of many- <br> parts of the chalk- districts I beg to lay before the Society a brief <br> account of the occurrence of similar blocks of large size in the Drift <br> of Suffolk both in situ and on the surface In the chapter on Druid <br> Sandstones or 'Sarsen Stones in Mr Prestwich's paper on the <br> Woolwich and Eeading Series Quart Journ Geol Soc vol x p 123 <br> the original source of these remarkable blocks is assig-ned to the sand- <br> beds of the Woolwich and Reading Series but less from the direct <br> evidence of their actual occurrence in situ than from the mineralogical <br> resemblance of the consolidated blocks to the Woolwich and Beading <br> Sands and from their geographical distribution pointing to a deriva- <br> tion from the Lower Tertiaries A case is also mentioned of the <br> occurrence of such blocks in Drift in which that author considers <br> that they were derived from the Woolwich and Reading Sands <br> Blocks of saccharoid sandstone also occasionally occur in the Bag- <br> shot Sands from which they appear to have been consolidated The <br> blocks of similar mineral character and structure about to be de- <br> scribed from the Quaternary Drift of Suffolk are so placed as to <br> render it certain that they were composed from the sands and gravels <br> of the drift where they now lie ; it would appear therefore that <br> such masses are not limited to any particular deposit but have been <br> consolidated from most of the sandy formations resting on the Chalk <br> The accompanying diagram represents the section of a well sunk <br> by Lady Middleton at Crowfield-Street near Coddenham together <br> Section from Chopping s Hill Farm to Crowfield-Street near <br> Coddenham Suffolk <br> Horizontal distance condensed <br> Well at Crowfleld <br> Street 111 feet deep <br> a Boulder-clay with fragments of chalk b Sand and gravel <br> blocks c Chalk <br> X Consolidated <br> with the outcrop of the strata between Crowiield and Coddenham 36344837 112028 51125 Page 110 Text v 23 http //www biodiversitylibrary org/page/36344837 1867 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 23 1867 Geology Periodicals Smithsonian Libraries bhl page 36344837 dc identifier http //biodiversitylibrary org/page/36344837 smithsonian libraries Information field Flickr posted date ISOdate 2014-03-10 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/13071276964 2015-08-26 14 57 36 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1867 The Quarterly journal of the Geological Society of London 1867 Photos uploaded from Flickr by Fæ using a script | ||||
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