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| Keywords: The Quarterly journal of the Geological Society of London (12895361634).jpg 1864 HULL AND GREEN MILLSTONE-GRIT 253 <br> row gorge of the Alport Its base is formed by the cliffs of Kinder <br> Scout; and its sides which are extremely irregular in outline by <br> the similar cliffs overlooking the two valleys just named Its upper <br> surface is somewhat uneven and is entirely composed of the Mill- <br> stone-grit which for the most part is buried beneath a thick coat- <br> ing of peat fissured into innumerable gullies and clefts which cause <br> an excursion across a surface which on the map appears a plain to <br> be in reality a succession of dips and emersions <br> Fig 3 ” Views of Rocks on the Peak <br> The grit however sometimes appears in little bosses or it throws <br> up groups of tabulated or fantastically-shaped stones the forms of <br> which I cannot but regard as the results of old marine denudation <br> In some places especially near Edale Head whole acres are covered <br> by these groups or multitudinous assemblages of water-worn rocks <br> Amongst the various forms the table is common but the smith's <br> anvil seems to be a special favourite ; nowhere else as far as my <br> acquaintance with these hills has extended have I observed such <br> numerous examples in the same space of seashore rocks <br> The flanks of the valleys in the Peak country are also remarkable <br> for enormous land-slips the origin of which may in many cases be <br> placed as far back as the final retirement of the sea at the close of the <br> glacial period Almost everywhere around the steep cliffs of the <br> Peak itself these slips occur and are easily to be accounted for <br> when we examine the nature of the beds which underlie the Scout <br> Grit forming the summit of the escarpment The grit is here un- <br> derlain by shales which intervene between it and the Yoredale <br> Grit Hence the latter being undermined by the retiring waters <br> or by atmospheric agencies as the case may be have yielded to the <br> enormous pressure of the superincumbent millstones which descended <br> in masses from their original elevations A similar arrangement of <br> the beds has caused the landslips or coast-slips amongst the Oolitic <br> escarpments of the south-west of England and the Chalk-downs <br> and indeed wherever solid rock forms a cliff resting upon strata of <br> clay or shale Alport Edge on the eastern side of the valley and <br> Coombs Rocks near Mottram afford similar instances worthy of <br> being noticed 36089506 111261 51125 Page 253 Text v 20 http //www biodiversitylibrary org/page/36089506 1864 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 20 1864 Geology Periodicals Smithsonian Libraries bhl page 36089506 dc identifier http //biodiversitylibrary org/page/36089506 smithsonian libraries Information field Flickr posted date ISOdate 2014-03-03 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/12895361634 2015-08-26 16 54 08 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1864 Photos uploaded from Flickr by Fæ using a script | ||||
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