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| Keywords: The Quarterly journal of the Geological Society of London (13960026463).jpg 36 ME H T BEOWN ON THE PEEMIA N <br> effects of the great Post-Carboniferous Pre-Permian movements <br> were at a maximum <br> Our Leicestershire rocks on the other hand are so entirely dis- <br> similar both in lithological characters and succession to the deposits <br> which occur on the eastern side of the Pennine chain from Notting- <br> hamshire to Durham and which doubtless underlie a large portion <br> of the north-east of England that on this account alone we should <br> suspect that the two series were laid down in different basins We <br> have seen that the Leicestershire rocks thin out rapidly to the north- <br> east and east against an old land-barrier ; and Mr E Wilson F G S <br> 'Midland Naturalist ' vol iv p 97 et seq \ has clearly shown that <br> whilst the Permians of the north-east of England thicken out towards <br> the north and east and acquire in these directions the characters of <br> deeper-water deposits the same beds when traced to the southward <br> become more arenaceous thin out and ultimately die away alto- <br> gether in the neighbourhood of Nottingham owing to the Coal- <br> measures rising up beneath them and forming what in Permian <br> times was a land-barrier <br> The most northerly exposure of the Leicestershire Permian is at <br> Ingleby 13 miles south-west of the nearest outcrop of the Notting- <br> hamshire Permian North and east of Ingleby the Permian is <br> absent and we know from the results of trials for coal at Wilford <br> Clifton Highfield Chitwell and Owthorpe that the same is the case <br> to the south and south-west of Nottingham These facts prove the <br> existence of a land-barrier between the two Permian lakes at this <br> point ; and there can be but little doubt that this had its origin in <br> the southerly extension of the Pennine disturbance which we have <br> seen produced well-marked effects even much further to the south <br> It is possible after making due allowance for a certain amount <br> of denudation in Bunter and Lower Keuper times to trace with a <br> fair approximation to accuracy a small portion of the old coast-line <br> of the western Permian lake Its probable course commencing on <br> the north was through Stanton-Bridge Ticknall Hartshorn Black- <br> fordby Ashby a little west of Heather Market Bnsworth then on <br> towards the northern part of the Warwickshire Coal-field whence it <br> must have taken a southerly course for some distance thus forming <br> a somewhat deeply indented bay facing north-west The rocks <br> forming the land on the south of this bay had already been folded in <br> a north-north-westerly and south-south-easterly direction ; and since <br> this folding of the Carboniferous and older Palaeozoics brought to <br> the surface beds of varying hardness there must have resulted a <br> series of ridges and valleys to some extent coincident with the <br> strike of the beds and resembling very much the contour of the <br> ground at the present time in the Nuneaton-Hartshill district <br> Down these strike- valleys flowed the streams bringing detritus into <br> the Permian lake from the high ground on the south We have <br> The so-called Permian between Derby and Ilkeston has been shown by <br> Mr Wilson to be brecciated Bunter sandstone and that of Dale Mill to be <br> Lower Coal-measure sandstone 36939775 113696 51125 Page 34 Text 45 http //www biodiversitylibrary org/page/36939775 1889 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 45 1889 Geology Periodicals Smithsonian Libraries bhl page 36939775 dc identifier http //biodiversitylibrary org/page/36939775 smithsonian libraries Information field Flickr posted date ISOdate 2014-04-21 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/13960026463 2015-08-26 06 57 12 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1889 Photos uploaded from Flickr by Fæ using a script | ||||
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