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| Keywords: The Quarterly journal of the Geological Society of London (13935362412).jpg 264 PEOCBEDINGS OP THB GEOLOGICAL SOCIETY Feb 7 <br> Dunnet Bay and Sinclair Bay Another low tract passes up the bed <br> of the Thurso water and along to the east coast by way of Dunbeath <br> The drift is spread in sheets filling up these troughs and levelling <br> the irregularities of the rocky strata so as to impart a smoother and <br> softer outline to the surface So far as I saw it does not form irre- <br> gular mounds and hillocks neither is it very rough on the surface <br> with erratic blocks ; it seems confined in a great measure to the <br> lower levels thinning out at altitudes of 100 or 150 feet The <br> thickness therefore varies much being greatest in those depressions <br> which descend nearly to the sea-level Thus at Scrabster harbour <br> in Thurso bay there are banks of it more than 100 feet high and <br> in some of the troughs of the south branch of the Dunbeath water <br> it is nearly as thick Deep masses occupy the hollow from Watten <br> to the Bay of Wick and also stretch along the Thurso river into the <br> very centre of the county There is also a good deal of it in the <br> bed of the Forss and at Lybster but at the Ereswick Burn it is com- <br> paratively thin In all these places it is of very much the same hue <br> being of a deep leaden-grey or slate-colour very dark when moist <br> and considerably paler when dry similar in fact to the colour of the <br> Caithness flags on which it rests Occasionally the upper portion is <br> of a browner more ferruginous tint which may be owing to the <br> influence of the atmosphere the percolation of surface-water or to <br> some other cause <br> Fig 2 � Scrabster Harhour <br> 1 Unstratified pebbly clay with Tery few broken shells <br> 2 Old Red Sandstone <br> The texture however varies a good deal in different places At <br> Scrabster harbour where it reaches a thickness of more than 100 <br> feet no difference can be perceived from top to bottom ; it is just <br> the same at the base where it is in contact with the ice-worn sur- <br> face of the subjacent rock as it is 100 or 150 feet higher up It <br> shows no stratification nor traces of gradual deposition It is a coarse <br> gritty mud exceedingly firm and difficult to pierce and thickly <br> charged with smaU stones which are dispersed very uniformly <br> throughout all parts of the deposit Pebbles of all sizes below that <br> of a man's fist or foot are the prevaiUng dimensions but stones of <br> from two to three feet in length also occur ; I saw no great erratic <br> blocks The stones are more or less worn and rubbed and many of <br> them show the glacial scratches A few small fragments of shells <br> are dispersed through all parts of the bank from the bottom to <br> within at least 15 feet of the top but are by no means common <br> Such is the character of the section at Scrabster and it is very much <br> the same along the banks of the Thurso water for several miles up 36164693 111477 51125 Page 264 Text v 22 http //www biodiversitylibrary org/page/36164693 1866 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 22 1866 Geology Periodicals Smithsonian Libraries bhl page 36164693 dc identifier http //biodiversitylibrary org/page/36164693 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 N02/13935362412 2015-08-26 06 55 38 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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