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| Keywords: The Quarterly journal of the Geological Society of London (12736293903).jpg 464 R HARKNESS AND H A NICHOLSON ON THE STRATA BETWEEN <br> Ci/bele verrucosa fflomus Bowmanni and Lichas laxatus can leave no <br> doubt as to the correctness of the inference that these rocks belong to <br> the Bala or Caradoc age The presence of what appear to be unequi- <br> vocal ashes which contain some of these fossils high up in the series at <br> Swindale also deserves attention as showing that the volcanic forces <br> which gave rise to the ashes and lavas of the Borrowdale group still <br> maintained an intermittent activity during the deposition of the <br> Dufton Shales There would thus appear to have been no break of <br> continuity between these shales and the underlying Borrowdale <br> rocks ” a conclusion which is further borne out by the substantial <br> identity between the fossils of the Dufton Shales and those of the <br> Style-End Grassing beds <br> The annexed section fig 1 exhibits the stratigraphical relations <br> of the Dufton Shales in Swindale Beck where as before stated <br> they are very well exposed <br> Fis 1 - <br> -JT INTJE <br> -Sketch Section of the Strata in Swindale Beck near Knock <br> Length rather more than half a mile <br> s sw <br> a Ashes belonging to the Borrowdale series <br> c Coniston Limestone <br> e Knock beds green and purple slates <br> / Black flags with Monographs colon us Barr probably Coniston Flags <br> b Dufton Shales <br> d Graptolitic mudstones <br> 2 Coniston Limestone <br> The Coniston Limestone notwithstanding its comparatively <br> small vertical extent has long occupied the position of being the <br> best-defined and most universally recognized of all the divisions of <br> the Lower Silurian series of the north of England ” a position which <br> it owes to its easily recognized lithological characters and to the <br> number of organic remains which it has yielded It is unnecessary <br> here to recapitulate the geographical range of the Coniston Lime- <br> stone Its main line of outcrop crosses the Lake-district in a direc- <br> tion from S W to X E running from Millom on the one hand to <br> Snap Wells on the other It is more or less developed in Raven- <br> stonedale Dentdale the Sedbergh valley near Ingleton in Ribblesdale <br> at Ireleth at High Haulme in Furness and at various points in <br> the Lower Silurians which lie to the south-west of the Cross-Fell <br> range <br> Lithologieally the term Coniston Limestone is somewhat mis- <br> leading as it is never wholly calcareous in its composition and the <br> calcareous element is occasionally almost wanting In its most <br> typical form as seen in its range between Long Sleddale and <br> Broughton Mills in Furness the Coniston Limestone consists of 35818615 110705 51125 Page 464 Text 33 http //www biodiversitylibrary org/page/35818615 1877 Geological Society of London NameFound Lichas laxatus NameConfirmed Lichas laxatus NameFound Shales Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 33 1877 Geology Periodicals Smithsonian Libraries bhl page 35818615 dc identifier http //biodiversitylibrary org/page/35818615 smithsonian libraries Information field Flickr posted date ISOdate 2014-02-24 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/12736293903 2015-08-26 19 59 19 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1877 Photos uploaded from Flickr by Fæ using a script | ||||
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