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| Keywords: The Quarterly journal of the Geological Society of London (13889867057).jpg BOrLDER-CLAT OP CHESHIRE <br> 593 <br> causes as that of some boulders of granite and trap to be alluded to <br> hereafter <br> When brick-making was in progress behind the Mission House in <br> Borough Road Birkenhead several blocks five or six of sand and clay <br> were exposed ; they contained a few erratic pebbles as well as <br> bauds an inch or so thick of vegetable mould In one the claj ey <br> and carbonaceous beds were doubled on themselves being so bent <br> at the flexure as to squeeze away the clay In this case also <br> the loose sand has fallen away and spread from the mass as it <br> settled down in the Boulder-clay One piece exhibited spots of <br> carbonaceous matter which are probably the rootlets of plants; <br> these are the only examples of vegetable life met with in the <br> Boulder-clay Being in close proximity to each other they pro- <br> bably all dropped from the same iceberg stranded at this spot The <br> only locality affording evidence of vegetation in situ during the <br> Glacial Period is at Leighton Hall Tealand Lancashire ; it occurs <br> as a band ten or twelve inches thick of Carboniferous-Limestone <br> pebbles each of which is covered with an intensely black car- <br> bonaceous powder ; this bed separates a lower from an upper por- <br> tion of an accumulation forming a moraine mound and indicates the <br> recession for a series of years of the glacier by which the mound <br> was formed <br> Blocks of the Boulder-clay itself which would escape notice <br> should they occur in the Boulder-clay proper in consequence of its <br> identity with them have been frequently observed in those stratified <br> sands and gravels previously referred to which cover the bottoms <br> of preglacial valleys such as Happy YaUey fig 2 ; similar blocks <br> Fig 2 ” Section in Happy Valley BirJcenJiead Height 10 feet <br> a Trias b Sand c Gravel <br> e Blocks of Boulder-clay in gravel and sand <br> d Boulder-clay <br> Mr D Mackintosh F G S found plant-remains in the Boulder-clay near <br> Crewe ; and Mr T Ward of ISi orthwich presented me with a fragment of wood <br> obtained at a depth of 35 feet in undisturbed Boulder-clay <br> 2t2 37047473 114009 51125 Page 593 Text 41 http //www biodiversitylibrary org/page/37047473 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 37047473 dc identifier http //biodiversitylibrary org/page/37047473 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 N02/13889867057 2015-08-26 04 56 31 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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