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| Keywords: The Quarterly journal of the Geological Society of London (12512997943).jpg 312 <br> PROCEEDINGS OF THE GEOLOGICAL SOCIETY April 24 <br> The exception occurs at Brisbane where a dyke of quartz por- <br> phyrite cuts through and is interstratified with the Mesozoic strata <br> Fig 19 ” Horizontal Cocd-Measures cut hy Trap-dyTces Pelican <br> Creek <br> there developed ; but its character is quite different from those of <br> Group 1 <br> At Gladstone a dyke of the only true trachyte yet met with in <br> the colony is quarried for building-stone PI XL fig 1 Its analysis <br> afforded me <br> SiHca 67-800 <br> Alumina 14-666 <br> Perric oxide 5-350 <br> Potash 5-653 <br> Soda 4-600 <br> Water constitution 0-700 <br> Water hygroscopic 0-600 <br> Specific gravity 2-320 99-369 <br> This rock resembles the trachyte of the Puy-de-Dome Crystals <br> of sanidin felspar occur in a crystalline felspathic base the iron <br> being in finely disseminated scales of iron-glance throughout the mass <br> No mineral veins occur in or near it It traverses the Devonian <br> series of the district ; and although there is no proof of its relative <br> age it has the appearance of a modern rock <br> The active influence of these trap disturbances of various periods <br> seems in Queensland to have been confined to the strip of country <br> lying about 200 miles back from and parallel to the eastern coast 34985325 108770 51125 Page 312 Text v 28 http //www biodiversitylibrary org/page/34985325 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 34985325 dc identifier http //biodiversitylibrary org/page/34985325 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 N02/12512997943 2015-08-27 10 01 24 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1872 Photos uploaded from Flickr by Fæ using a script | ||||
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