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| Keywords: The Quarterly journal of the Geological Society of London (13889861498).jpg AT GREAT CEOSBY LANCASHIRE <br> 455 <br> It was not until several examinations were made that I was able <br> to discover any striations on the imbedded sandstone At last I <br> detected them on a block measuring 4 ft x 2 ft 10 in x 1 ft 9 in <br> in extreme dimensions On washing the marl - clay off the face <br> very good parallel groovings were disclosed running along the plane <br> of bedding and the longer axis With this clue I soon saw that <br> the undersides of most of the stones were polished smooth and others <br> irreffularlv scratched <br> Section at Moiuhrey Brich and Tile WorJcs Great Croshy <br> a a Grey shaly Keuper marl h Hard band in Keuper marl broken off at h\ <br> b b Fragments of hard band b scattered through and imbedded in <br> the kneaded-up marl c c Kneaded-up marl that is the Keuper <br> marl or shale worked-up into a grey clay d d Blocks of sandstone <br> some fine-grained and strong others coarser in grain and often smoothed <br> and striated in one instance strongly fluted e Half-imbedded block <br> / Low-level Boulder-clay marine containing far-travelled erratics and <br> broken marine shells brown in colour <br> Specimens of the undisturbed marl and the kneaded-up marl <br> were sent to Mr David Eobertson F G S who kindly examined <br> them microscopically Xo organisms were found in either and they <br> were practically of the same constitution jSTo far-travelled erratics <br> nor any stones or material that could not be referred to the Keuper <br> formation could be found in the kneaded-up marl Even the half- <br> imbedded stones were in all cases that I have seen Keuper sand- <br> stones The true erratics are confined to the overlying Low-level <br> Boulder-clay This clay is so distinctive a deposit that it is only <br> necessary to say that here as elsewhere it contains fragments of <br> marine shells and is undoubtedly of aqueous and marine origin <br> Imjjortance of the Discovery ” The evidence of these disturbed <br> shales is of importance taken in connexion with the prevalence in <br> South-west Lancashire and Cheshire of glacial markings and <br> smoothed rocks <br> At the present moment March 1885 is to be seen a very fine <br> example of polished and striated rock at Flaybrick Hill Birkenhead <br> Cheshire a veritable roche moutonnee which has only just been bared <br> of its covering of Low-level Boulder-clay <br> It has however been a moot point with local geologists whether <br> these markings are due to land- or floating ice I have myself <br> always considered that the weight of evidence preponderated in <br> favour of land-ice though there are some facts apparently rrrecon- <br> 2i2 37047325 114009 51125 Page 455 Text 41 http //www biodiversitylibrary org/page/37047325 1885 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 41 1885 Geology Periodicals Smithsonian Libraries bhl page 37047325 dc identifier http //biodiversitylibrary org/page/37047325 smithsonian libraries Information field Flickr posted date ISOdate 2014-04-30 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/13889861498 2015-08-26 04 59 13 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1885 Photos uploaded from Flickr by Fæ using a script | ||||
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