MAKE A MEME View Large Image The Quarterly journal of the Geological Society of London (13937295321).jpg COTTESWOLD MIDFOKD AND YEOVIL SANDS ETC 457 <br> On the other hand the Midford Sands have been defined as <br> equal to the zones of Amm ojpalinus and Amm jurensis ...
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Keywords: The Quarterly journal of the Geological Society of London (13937295321).jpg COTTESWOLD MIDFOKD AND YEOVIL SANDS ETC 457 <br> On the other hand the Midford Sands have been defined as <br> equal to the zones of Amm ojpalinus and Amm jurensis ; but <br> in all probability the lower part of the Cotteswold Sands ” the part <br> containing Amm bifrons ” belongs to the Commune-zone Then too <br> it is just the opposite in Somerset where it is the Upper-Lias Clay <br> of Ilminster which contains the greater part of the Jurense-zone <br> Again part of the Inferior-Oolite Limestone of Dorset and of the <br> Cotteswolds is in the zone of Amm opalinus Therefore this latter <br> definition does not coincide with the first <br> According to either view we arrive at an absurdity namely part <br> of the Upper-Lias Clay must be in the Inferior Oolite series ; or <br> beds containing several of the same species of Ammonites must be <br> in the Lias in one place and in the Inferior Oolite in another <br> After all the term Midford Sands is only used locally The <br> Dogger Sands of Yorkshire and part of the Northampton Sands <br> are contemporaneous with the upper part of the Yeovil Sands ; but <br> they are not included in the term Midford Sands Is there the <br> least advantage in retaining a term ” a merely local term ” which as <br> I have shown includes deposits that are by no means contempor- <br> aneous Its only advantage is that it does away with two names; <br> but the result is absolute inaccuracy The terms Cotteswold Mid- <br> ford and Yeovil Sands may be retained as merely local names for <br> certain deposits in the same way as Pea-grit Oolite Marl c ; <br> they should have no wider signification than the district to which <br> they apply and should not be used where strict scientific accuracy <br> is required but should give place to their zonal equivalents <br> It would almost seem as if the sands between Liassic Clay and <br> Oolitic Limestone were a somewhat singular deposit ; but the fact <br> of the matter is that from a rather remote period until a much <br> later one than we are treating of sandy strata have been deposited ” <br> in no two districts contemporaneously but generally first in one <br> place and then in another Why then is it desired to mark off the <br> Midford Sands as a distinct series ” not all across England but <br> only locally <br> The Jamesoni- and Caprleornum- zones are characterized by mica- <br> ceous and sandy shales at Eobin Hood's Bay in Yorkshire t <br> The Henley i-zone in Gloucestershire is largely made up of sandy <br> strata very similar to the Cotteswold Sands <br> The Margaritatus- and Spinatus-zones in Dorset contain sandy <br> strata often undistingnishable from the Yeovil Sands <br> The zone of Amm annulatus in Yorkshire is represented by hard <br> and compact grey and micaceous sandy shale t <br> What is probably the upper part of the Commune-zone is com- <br> posed of micaceous sands in Gloucestershire <br> The Jurense-zone is made up of sands at Bath while lastly the <br> OpaUnum-zone at Burton Bradstock is chiefly sands <br> Passing to the continent Oppel § shows us that at Wasseralfingen <br> H B Woodward op cit p 285 <br> f H B Woodward op cit p 269 <br> H B Woodward op fit p 277 <br> § Oppel ' Juraformation ' p 328 36940280 113696 51125 Figs 1-2 Text 45 http //www biodiversitylibrary org/page/36940280 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 36940280 dc identifier http //biodiversitylibrary org/page/36940280 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 N02/13937295321 2015-08-26 05 52 59 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1889 Photos uploaded from Flickr by FĂŚ using a script
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