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| Keywords: The Quarterly journal of the Geological Society of London (13935378792).jpg 1866 JAMIESON CAITHNESS 267 <br> Fig 5 Oil the Thurso Water near Thurso <br> Sfcream Farmhouse W <br> The high banks on both sides of the stream consist of unstrafcified pebbly clay <br> or gritty mud with a few traces of broken shells <br> from rocks in some part of the county with the exception of one of <br> granite near Castletown which he thought was different from any <br> of the Caithness granites and had probably come from Sutherland <br> where a similar quality of rock is known to occur <br> 4 State of the Shells The shells as a rule occur in broken frag- <br> ments The most common kinds are the Oyprina Islandica Turri- <br> tella ungulina Astarte horealis A elliptica Tellina calcaria and T <br> Balthica Although broken pieces are the rule yet exceptions <br> sometimes occur Thus during the search that I myself made I <br> found one entire valve of Astarte horealis another of A elliptica <br> and two small ones of A compressa likewise a specimen of Natica <br> nitida and another of JSf Islandica both almost perfect And in <br> the collections of Mr Joseph Anderson and Mr Eobert Dick I saw <br> several entire single valves of Astarte and Leda on which there were <br> occasionally small portions of the epidermis or skin remaining also <br> entire specimens of Mangelia and Nassa Mr Peach has even got <br> a specimen of Anomia with both valves complete in a fine state of <br> preservation and this was in the drift containing the usual assem- <br> blage of ice-worn stones and broken shells the only instance of an <br> entire bivalve that I have heard of The Tur itella which is one of <br> the most common of all the species although always more or less <br> imperfect yet frequently occurs in large pieces some of them not <br> far from being entire I nowhere observed any instance of the shells <br> being found in an undisturbed condition nor could I hear of any <br> such having been found ; there seems to be no such thing as a bed <br> of laminated silt with shells in situ Even the Foraminifera when <br> seen through the microscope have a rubbed worn appearance No <br> clay suitable for the manufacture of bricks and tiles or drain -pipes <br> has been got in Caithnes it is all too sandy and full of stones The <br> laminated brick-clays are in short entirely absent <br> Many of the shell-fragments show marks of glacial action It is <br> generally on the stouter pieces of Cyprina and Astarte that these are <br> to be seen but I found some fragments of Tellina calcaria distinctly <br> marked Now this is rather a delicate fragile shell and the fact of <br> its being so marked and yet not crushed to powder shows how gentle <br> in some cases the action must have been that imprinted these <br> markings Where the shell-fragments are of an elongated form the <br> scratches run lengthways along them just as they do on the pebbles <br> I have one piece of shell which T picked up myself not quite an <br> inch long most beautifully marked with a multitude of fine parallel <br> scratches as if done by the point of a needle and quite polished even <br> u2 36164696 111477 51125 Page 267 Text v 22 http //www biodiversitylibrary org/page/36164696 1866 Geological Society of London NameFound Astarte compressa NameConfirmed Astarte compressa EOLID 10721059 NameBankID 2798214 NameFound Astarte elliptica NameConfirmed Astarte elliptica EOLID 450509 NameBankID 2693184 NameFound Astarte horealis NameConfirmed Astarte borealis Schumacher 1817 EOLID 448737 NameBankID 511449 NameFound Cyprina NameConfirmed Cyprina NameBankID 4132765 NameFound Foraminifera NameConfirmed Foraminifera EOLID 2869058 NameBankID 5953016 NameFound Mangelia NameConfirmed Mangelia EOLID 10713039 NameBankID 2686113 NameFound Nassa NameConfirmed Nassa EOLID 2988944 NameBankID 4252520 NameFound Natica nitida NameConfirmed Natica nitida EOLID 4863114 NameFound Oyprina NameFound Tellina calcaria Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 22 1866 Geology Periodicals Smithsonian Libraries bhl page 36164696 dc identifier http //biodiversitylibrary org/page/36164696 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 N02/13935378792 2015-08-26 06 53 12 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1866 Photos uploaded from Flickr by FĂŚ using a script | ||||
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