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| Keywords: The Quarterly journal of the Geological Society of London (12981355314).jpg M <br> PEOCEEDINGS OF THE GEOLOGICAL SOCIETY <br> June 9 <br> These two analyses show the important bearing which chemical <br> composition has on jointing ; justifying the conclusion so far as the <br> limestone of this neighbourhood is concerned that the perfection of <br> the jointing is in proportion to the purity of the limestone <br> Jointings in other rocks ” That the lithological character of the rock <br> is a matter affecting the nature of the divisional planes known under <br> the name of joints is in many instances weU shown in rocks which <br> do not appertain to the Carboniferous series and in which limestones <br> do not occur <br> Among the arenaceous sandstones which constitute the Triassic <br> formation of Cumberland the effect of a difference in mineral com- <br> position is in some localities well seen One of these localities is at <br> the quarries of Howrig near the Curthwaite Station on the Maryport <br> and Carlisle Eailway Here we have thin-bedded red sandstones <br> dipping 12° N by W ; and these sandstones are generally intersected <br> by vertical joints which have a N and S course The joints in <br> each stratum commonly terminate with the bed The strata of sand- <br> stone are either separated from each other by a thin parting of red <br> shale or have more argillaceous matter entering into their composi- <br> tion near their bounding places In either of these cases the pre- <br> sence of this argillaceous matter produces an effect on the jointings <br> rendering them less perfect and more indistinct in the more argilla- <br> ceous portions The result of this change in lithological character <br> is represented in fig 8 <br> Fig 8 ” Jointing in Triassic Sandstone Howrig Cumberland <br> Sandstone <br> Shale <br> The Silurian rocks of the south of Scotland in some cases exhibit <br> the effect of various mineral characters on jointing In 'ciunnie <br> quarry in the parish of Troqueer in the Stewartry of Kirkcudbright <br> about 2i miles west from the town of Dumfries this is beautifully <br> represented; the strata here being of greywacke-sandstones and 36161633 111474 51125 Page 94 Text v 15 http //www biodiversitylibrary org/page/36161633 1859 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 15 1859 Geology Periodicals Smithsonian Libraries bhl page 36161633 dc identifier http //biodiversitylibrary org/page/36161633 smithsonian libraries Information field Flickr posted date ISOdate 2014-03-07 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/12981355314 2015-08-26 14 52 03 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1859 Photos uploaded from Flickr by Fæ using a script | ||||
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