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| Keywords: The Quarterly journal of the Geological Society of London (12684285213).jpg 150 <br> PROCEEDINGS OF THE GEOLOGICAL SOCIETY Feb 25 <br> After these remarks we are at once prepared to compare the rocks <br> developed in the great transverse sections of the Welsh and Cumbrian <br> mountains The lower Cambrian groups Bangor and Festiniog <br> Nos 1 and 2 tabular view are amply represented by the green slates <br> and porphyries of Cumberland The upper Cambrian groups Bala and <br> Caradoc Nos 3 and 4 are however imperfectly in thickness clearly <br> Diagram illustrating the Comparative Development of the Silurian <br> and Cambrian Rocks in Wales and Cumbria respectively <br> Cambria Cumbria <br> Upper PALiEozoic <br> Middle PALiEozoic <br> Ludlow <br> Wenlock <br> Caradoc <br> Upper Bala <br> Bala Limestone <br> /Carboniferous Lime- <br> l stone <br> Old Red Sandstone <br> Kirkby flags <br> Coarse slates <br> Ireleth slates <br> Coniston grits <br> Coniston flagstone <br> Coniston limestone <br> Lower Bala <br> Slates and porphyry <br> Arenig slates and por- <br> phyry <br> Tremadoc slates <br> Lingula flags <br> Harlech grits <br> Llanberris slates <br> Metamorphic <br> Granite <br> SMddaw slates <br> Metamorphic <br> Granite <br> represented by the Coniston limestone flagstone and the hard coarse <br> grits of the Westmoreland sections <br> The equivalents in the North of England of the Wenlock and <br> Ludlow groups Nos 5 and 6 have already been noticed Using the <br> words Silurian System in any definite sense these are the groups <br> which truly and exclusively belong to it as a system ; for the Caradoc <br> the characteristic Wenlock species ; while the so-called Caradoc sandstone of May <br> Hill contains the Wenlock fossils in abundance and none of the characteristic <br> Cambrian types But is there a single section in which these two distinct groups <br> of fossils appear together in one stage If no such section can be found why may <br> we not suppose that the Caradoc sandstone of May Hill is a group superior to the <br> Caradoc sandstone of Horderley Should we ever be able to answer this question <br> in the afBrmative the ambiguity alluded to in the text would be at an end The <br> statement here given is drawn from the fossil evidence supplied by the Cambridge <br> Museum 35461152 109911 51125 Page 150 Text v 8 http //www biodiversitylibrary org/page/35461152 1852 Geological Society of London NameFound Cambria NameConfirmed Cambria NameBankID 4453973 NameFound Lingula NameConfirmed Lingula EOLID 11118945 NameBankID 2765654 Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 8 1852 Geology Periodicals Smithsonian Libraries bhl page 35461152 dc identifier http //biodiversitylibrary org/page/35461152 smithsonian libraries Information field Flickr posted date ISOdate 2014-02-21 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/12684285213 2015-08-27 12 57 45 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1852 Photos uploaded from Flickr by Fæ using a script | ||||
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