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| Keywords: The Quarterly journal of the Geological Society of London (14076960164).jpg 592 <br> C RICKETTS ON THE ERKATICS IN THE <br> thus surcharged -with mud may account for the entire absence of <br> marine life ; fractured rarely perfect shells occur sparsely scattered <br> in the clay but neyer under such circumstances that it could be <br> imagined they had lived where found <br> The pebbles and boulders imbedded in the clay and from which <br> the formation derives its name consist of fragments of hard rock <br> from the size of minute grains to two or three feet or more in <br> diameter such as may have been derived from lands encompassing <br> the Bay of Liverpool and the adjoining portion of the Irish Sea � <br> from Cumberland the south-west of Scotland the north and east of <br> Ireland and K'orth ales Their surfaces are very generally flattened <br> smoothed and polished and a large proportion are covered with <br> striae grooves and scratches universally acknowledged to have been <br> caused by abrasion beneath glaciers If it is conceded that they <br> have dropped into the clay from floating ice their number is such <br> as would indicate that the whole bay was sufiiciently packed with <br> bergs and floes to prevent altogether the formation of waves and <br> therefore in the absence of other currents no evidences of strati- <br> fication are afforded <br> Amongst the erratics in the Boulder-clay may be included masses <br> of unconsolidated sands and gravels often alluded to by local <br> geologists as pockets of sand c The materials resemble accumu- <br> lations already referred to as situated in the bottoms of valleys as a <br> bed upon which the Boulder-clay reposes ; their general shape is <br> comparable to that of the section representing masses containing a <br> remarkable collection of dark green blocks of disintegrated traps <br> unmixed with other boulders exposed in 1878 during the con- <br> struction of the Bootle Docks fig 1 These were imbedded in a <br> Pig 1 � Section in Bootle Docks Liverpool <br> Length aboat 28 feet <br> a Trias h Gravel c Boulder-clay <br> d Masses containing disintegrated Trap <br> light green sandy matrix and formed accumulations which were <br> very conspicuous the colour being in marked contrast to that of the <br> Boulder-clay ; their disintegration must have been due to the same <br> However great the agitation of the sea may be in the open ocean and <br> though it may dash its waves with wild fury on the edge of the ice within the <br> ice-girdle it is undisturbed 'New Lands within the Arctic Circle ' by Lieut <br> Julius Payer chap i § 23 <br> In January 1881 the Mersey was covered with floating ice or rather snow <br> for nearly its whole width ; on the waves reaching the ice they terminated in a <br> swell for a short space whilst inside the surface was perfectly unmoved 37047472 114009 51125 Page 592 Text 41 http //www biodiversitylibrary org/page/37047472 1885 Geological Society of London NameFound Julius NameConfirmed Julius NameBankID 4209283 Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 41 1885 Geology Periodicals Smithsonian Libraries bhl page 37047472 dc identifier http //biodiversitylibrary org/page/37047472 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 N02/14076960164 2015-08-26 04 59 01 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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