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| Keywords: The Quarterly journal of the Geological Society of London (12961247995).jpg 414 <br> PEOCEEDINGS OF THE GEOLOGICAL SOCIETT JunC 23 <br> 3 <br> <br> Ss <br> g <br> O <br> r <br> <br> <br> S <br> § <br> OQ <br> <br> 5 <br> o <br> 55 <br> » <br> rO <br> J» <br> pq <br> i <br> ' ' I <br> y v <br> / Origin of the JBlachjoool Drifts ” Leaving the question of the <br> origin of the Postglacial deposits to those who have devoted more at- <br> tention to their character as exhibited on <br> different parts of the Lancashire coast I may <br> i remark that while few would doubt the <br> marine-glacial origin of the Upper Boulder- <br> r5 ' clay and while no one can dispute the purely <br> w marine origin with the exception of boulders <br> S drifted into it by floating ice of the middle <br> sand and gravel formation the precise mode <br> 1- of accumulation of the Lower Boulder-clay <br> '4 v j – -g appears involved in mystery At first sight <br> i v 'ntfj\ S ts y one might hastily conclude that it is a <br> land-glacial deposit ; but a reconsideration <br> of its varied phenomena and a correlation <br> of this clay with what we have reason to <br> I believe are equivalent deposits on the other <br> © side of Morecambe Bay see sequel and in <br> 'o' South Lancashire would seem to point to <br> accumulation under mixed glacial and marine <br> 'tf conditions Admitting that the stones and a <br> pq ° great part of the clay were furnished by <br> land-ice in the Carnforth area the stones <br> would appear to have been transported chiefly <br> by coast-ice ; see sequel the sea at least <br> must have kept u what may be called a <br> running accompaniment to the accumulation <br> of the drift-matter by washing out and re- <br> depositing its finer parts in the shape of <br> laminated loam In some parts of IN'orth- <br> west Lancashire the Lower Boulder-clay may <br> be entirely a land accumulation; but it is <br> difficult to resist the belief that where this <br> 1 r formation spreads out continuously over large <br> U flat areas it must have been deposited under <br> -o the surface of the sea It may likewise <br> be remarked that at Blackpool the numerous <br> granitic boulders and stones which could not <br> results of the first thorough minute and systematic <br> - ¢ – ' T investigation that has yet been made of tlae succession <br> Ait y/ ' j M' of Postglacial deposits and their connexion with <br> J\T\ Mly;\ i Is deposits of the prehistoric and historic periods He <br> cMm ' A ' ' ž has been surveying the country south and east of <br> ' £ Southport <br> I have just learned March 1869 that Mr <br> g Morton F G- S some time ago discovered sea shells <br> o in Lower Boulder-clay near Liverpool and that one <br> ' of the Geological Surveyors whose name I am not <br> S yet at liberty to publish has made a discovery during <br> p4 a short visit to Blackpool which demonstrates that <br> i- the Lower Boulder-clay there is at least partly of <br> marine origin <br> J -S <br> o PI <br> o <br> - <br> ;5 <br> f <br> ¢ M 36103289 111288 51125 Page 414 Text v 25 http //www biodiversitylibrary org/page/36103289 1869 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 25 1869 Geology Periodicals Smithsonian Libraries bhl page 36103289 dc identifier http //biodiversitylibrary org/page/36103289 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 N02/12961247995 2015-08-26 14 59 32 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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