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| Keywords: The Quarterly journal of the Geological Society of London (13935691762).jpg 1866 <br> DAWSON LAUEENTIAN ANNELIDS <br> 609 <br> rock and lined around their circumference with dense and dark- <br> coloured siliceous matter while the axis which is often of a bilohate <br> form is comparatively transparent and of softer texture The per- <br> forations are often at right angles to the bedding hut in some cases <br> nearly parallel with it <br> In regard to the origin of these perforations I suppose that they <br> may have been either 1 burrows of worms filled with sand sub- <br> sequently hardened and stained at the surface or 2 tubes com- <br> posed of sand like those of Sahella or 3 cavities left by the <br> decay of Algae and filled with sand The first I think the most <br> probable view <br> Figs 1-5 � Illustrating supposed Annelid-tuhes from tlie <br> Laurentian Rocks of Canada <br> '4 <br> b e a <br> Fig 1 Transverse section of Worm -burrow Magnified as a transparent object <br> a Calcareo-siliceous rock c Sand agglutinated and stained black <br> h Space filled with calcareous spar I d Sand less agglutinated and unco- <br> I loured <br> Fig 2 Transverse section of Worm-burrow on weathered surface Natural size <br> 3 The same magnified <br> 4 Spicule magnified <br> 5 Lenticular body magnified <br> I may add that the beds at Madoc containing these supposed <br> fossils hold also on their weathered surfaces impressions with rude <br> casts of concentric laminae like those of Stromatopora or Eozoon <br> but too obscure for determination The limestones interstratified <br> with these beds also contain fragments of Eozoon not fossilized by <br> serpentine but simply by carbonate of lime carbonaceous fibres <br> spicules like those of sponges and lenticular bodies of unknown <br> nature 36165064 111477 51125 Page 609 Text v 22 http //www biodiversitylibrary org/page/36165064 1866 Geological Society of London NameFound Eozoon NameConfirmed Eozoon NameBankID 4158090 NameFound Stromatopora NameConfirmed Stromatopora EOLID 6867922 NameBankID 4354294 Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 22 1866 Geology Periodicals Smithsonian Libraries bhl page 36165064 dc identifier http //biodiversitylibrary org/page/36165064 smithsonian libraries Information field Flickr posted date ISOdate 2014-04-21 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/13935691762 2015-08-26 06 53 46 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1866 Photos uploaded from Flickr by Fæ using a script | ||||
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