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| Keywords: The Quarterly journal of the Geological Society of London (13205744925).jpg 1847 MURCHISON ON THE SILURIAN ROCKS OF N WALES ETC 167 <br> if' d <br> y ' <br> wacke which was meant to represent cer- <br> tain inferior urifossiliferous rocks like those <br> of the Longmynd range of Shropshire Now <br> on sending a copy of my new classification to <br> M Elie de Beaumont that eminent geolo- <br> gist wishing to mark strata separated by <br> lines of dislocation by separate names sug- <br> gested the propriety of further distinguish- <br> ing those last-mentioned unconformable and <br> inferior rocks by the term Hercynian as <br> taken from the Hartz mountain in Germany <br> where as he then believed the oldest slaty <br> group would prove to be of higher antiquity <br> than the strata to which I had applied the <br> word Silurian Unwilling that the name <br> for these infra- Silurian rocks should be <br> taken from a foreign country in which no <br> precise palaeozoic horizon had then been <br> lixed I at once urged Professor Sedgwick <br> to apply to his slaty rocks which were con- <br> fidently believed to be inferior to my own <br> some term on the same geographical prin- <br> ciple by which I had been governed in pro- <br> posing Silurian/' I even ventured to sug- <br> gest the word Snowdonian because I <br> knew that my friend then considered the <br> N W portion of the Welsh chain to be made <br> up of the oldest fossiliferous masses ; but <br> preferring a more comprehensive geogra- <br> phical name he took that of Cambrian <br> With this arrangement we both felt certain <br> that no anomaly could be introduced into <br> the lower palaeozoic classification as the re- <br> lations and fossil contents of mineral masses <br> which v/ere contiguous must be eventually <br> cleared up without fear of error or the in- <br> troduction of theoretical views <br> The word Cambrian as far as I know <br> was first used in print by myself in the year <br> 1836 in describing the structure of Pem- <br> brokeshire But whilst I then spoke gene- <br> rally of such Cambrian rocks and after- <br> wards at greater length in my large volume <br> their analysis and examination formed no <br> part of my scope ; that task having been <br> specially undertaken by Professor Sedgwick <br> at a time when I really believed that from <br> their great thickness apparent inferiority <br> and different lithological structure they <br> would be found to contain a suite of orga- <br> N 2 36932896 113687 51125 Page 167 Text v 3 http //www biodiversitylibrary org/page/36932896 1847 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 3 1847 Geology Periodicals Smithsonian Libraries bhl page 36932896 dc identifier http //biodiversitylibrary org/page/36932896 smithsonian libraries Information field Flickr posted date ISOdate 2014-03-17 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/13205744925 2015-08-26 12 51 11 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1847 Photos uploaded from Flickr by Fæ using a script | ||||
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