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| Keywords: The Quarterly journal of the Geological Society of London (13889862879).jpg BOFLDER-CLAT OF CHESHIRE <br> 597 <br> moraine mound at Leighton Hall ; and another of fantastic shape is <br> hardly distinguishable from an example near Shap whilst others <br> of a similar kind bear a striking resemblance to each other <br> Fig 6 ” Weathered hlocJc <br> from Moraine One <br> third natural size <br> rig 7 ” Weathered hlock from <br> Moraine One third natural <br> size <br> Several blocks subsequently to being weathered have had portions <br> of their surface rubbed ; this generally occurs over a very limited <br> space and leaves adjoining and even more prominent parts entirely <br> untouched fig 5 Ko example has jet been found in moraines; <br> but it may be concluded that this attrition could not have been <br> caused by propulsion along the rock-surface over which the glacier <br> moved It is more probable that carried forward by an accumulating <br> glacier thin pebbles have rubbed against others imbedded in the <br> same moraine-heap <br> Pieces of flint occur in the Boulder-clay but they are rare <br> Some have had flakes forcibly broken off it may be several from <br> the same specimen occasionally the depression is formed which is <br> the counterpart to the bulb of percussion ; and at this point the <br> flint is sometimes crushed as if from the intensity of the pressure <br> by which a flake has been splintered off In others the more <br> prominent and rounded portions of the nodules bear evidence of <br> being rubbed and chipped as by a grinding motion under pressure <br> There are none which have been rounded by the rolling motion <br> caused by waves or currents <br> The rarity of flints in the Boulder-clay is not surprising if it is <br> considered that they have been carried into the Bay of Liverpool by <br> means of icebergs and floes which ploughed their way across <br> through closely packed ice distributing their load of boulders in the <br> passage ; even in the glacial accumulations in the neighbourhood <br> of Belfast in close proximity to the Chalk formation they are not <br> found to be very abundant Many of the flints in the Eskers and 37047477 114009 51125 Page 597 Text 41 http //www biodiversitylibrary org/page/37047477 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 37047477 dc identifier http //biodiversitylibrary org/page/37047477 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 N02/13889862879 2015-08-26 04 53 46 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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