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| Keywords: The Quarterly journal of the Geological Society of London (14073294851).jpg 74 <br> PB0CEEDr5rGS OF THE EOLOGICAI SOCIETT <br> may call type-forms to justify us in the assumptioii of the existence <br> of species for purposes of classification and I tmst that I have <br> indicated a natoral and logical principle on which to proceed The <br> relations then of the groups may be expressed graphically in the <br> annexed diagram <br> In the above sketch of what appears to me a natural system of <br> classification I take no notice as above stated of the geological age <br> of the rock which is regarded as of primary importance by many <br> continental investigators who consider Pre-Tertiary igneous rocks <br> always separable from those of later date For this distinction I 37047564 114009 51125 Page 74 Text 41 http //www biodiversitylibrary org/page/37047564 1885 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 41 1885 Geology Periodicals Smithsonian Libraries bhl page 37047564 dc identifier http //biodiversitylibrary org/page/37047564 smithsonian libraries Information field Flickr posted date ISOdate 2014-04-30 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/14073294851 2015-08-26 04 53 50 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1885 Photos uploaded from Flickr by Fæ using a script | ||||
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