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| Keywords: The Quarterly journal of the Geological Society of London (12513338504).jpg 1872 <br> DAINTEEE GEOLOGT OF QIJEENSLAND <br> 311 <br> With regard to the age of these dykes much has yet to be learned <br> From all the evidence collected I should be inclined to place their <br> succession in time as follows <br> 1st The porphyrites and porphyries range from the Metamorphic <br> to the Devonian <br> 2nd and 3rd The diorites diabases and serpentines range through <br> all the Devonian period the action being most intense in the lower <br> portion of the series ; and the interstratified diabase ashes and tufas <br> at Gympie favour this idea <br> 4th The trachytes and felsites are of uncertain date but are cer- <br> tainly younger than Group 2 <br> The true Carboniferous and Mesozoic Carbonaceous of Eastern <br> Queensland 'are constantly penetrated by trap-dykes ; but ivitli one <br> exception these are dolerites differing in no respect from the older <br> and newer Tertiary volcanic series of the colony and no vein- stones <br> Fig 18 Bolerite Dyke traversing Desert Sandstone ' Grariite <br> CreeTc Gilbert District Northern Queensland <br> of arri hind are found in the bounding strata neither is alteration <br> observed at the point of contact see Figs 18 19 34985324 108770 51125 Page 311 Text v 28 http //www biodiversitylibrary org/page/34985324 1872 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 28 1872 Geology Periodicals Smithsonian Libraries bhl page 34985324 dc identifier http //biodiversitylibrary org/page/34985324 smithsonian libraries Information field Flickr posted date ISOdate 2014-02-14 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/12513338504 2015-08-27 09 50 35 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1872 Photos uploaded from Flickr by FĂŚ using a script | ||||
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