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| Keywords: The Quarterly journal of the Geological Society of London (12512005023).jpg 1853 <br> HARKNESS KIRKCUDBRIGHT SILURIANS <br> 183 <br> 2 li <br> 3 <br> Mary A little to the east of this place the grits are traversed by <br> veins of sulphate of barytes At Port Mary the Silurians again <br> make their appearance and in the course of the small burn are seen <br> dipping S S E at an angle of 55° <br> Immediately west from Port Mary the grits <br> reappeai' and run along the coast to Abbey <br> Burnfoot ; where the silurians are seen having <br> a north inclination at Guthries Pool Up the <br> Netherlaw Glen from whence the burn flows <br> the inclination of the silurians is the reverse of <br> what occurs at Guthries Pool being to the <br> south at an angle of 50° <br> ' £ From Abbey Burnfoot westward the grits <br> again occur and occupy the coast to Nether- <br> law Here they consist of red-coloured beds <br> containing rounded and angular fragments of <br> quartz and silurian rock and have a southerly <br> dip at an angle of 1 7° which is the prevailing <br> dip of the carboniferous equivalents in this <br> county <br> At Netherlaw Point commence the series of <br> silurian rocks which it is the object of this paper <br> more particularly to notice Some of these have <br> been more or less fully described in a former <br> paper ; but the relation they bear to the de- <br> posits constituting the great mass of the silu- <br> rians of the South of Scotland has not yet <br> been shown Near the summit of the headland <br> the silurian strata are covered by the carbo- <br> niferous grits but the point of contact between <br> the two formations is not seen ; they consist <br> of 1 uppermost Shale and sandstone; 2 <br> Vl Sandstone; and 3 Graptolite Shale <br> No 1 comprise in the Upper part ” light- <br> grey shales with calcareous nodules alter- <br> nating with light-grey sandstones in beds <br> rarely exceeding a foot in thickness The un- <br> der-surface of the sandstone is ripple-markedf <br> as seen at Netherlaw and Gipsey Points <br> This sandstone at Gipsey Point is much coarser <br> than that at Netherlaw Point of which it is a <br> repetition and it contains fragments of quartz <br> and jasper and a fragment also of syenite was <br> found in it by the author similar to the syenite <br> See Quart Joum Geol Soc vol vii p 54 <br> t These ripple-marks are not of the waved form which usually occurs on <br> ripple-marked sandstone but consist of irregular hollows and sinuous elevations <br> often terminating abruptly A similar ripple-mark occurs on the under-surface <br> of the red sandstones near Annan Dumfriesshire where they lie on beds of day <br> See Quart Joum Geol Soc vol vi p 397 <br> 5 <br> y i 34983296 108767 51125 Page 183 Text v 9 http //www biodiversitylibrary org/page/34983296 1853 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 9 1853 Geology Periodicals Smithsonian Libraries bhl page 34983296 dc identifier http //biodiversitylibrary org/page/34983296 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 N02/12512005023 2015-08-27 09 52 14 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1853 Photos uploaded from Flickr by Fæ using a script | ||||
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