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| Keywords: The Quarterly journal of the Geological Society of London (12961600944).jpg 1869 ORiLEROD DAETMOOK GRANITE 277 <br> mile mark the places to which the granite extended before it curved <br> down to the N S as before mentioned At Wattern tor fig 2 <br> Fig 2 Wattern Tor from the South showing the decay along the <br> lines of North and South Joints <br> the chief mass is crossed by two north and south lines along which <br> decay has acted dividing the upper part into three masses and <br> forming one of the most imposing tors on the moor To the N E <br> of this tor there is a narrow ridge with low cliffs on both sides <br> formed by parallel N S lines of joint ; and at one place in <br> consequence of decay along the E W joint the storms have <br> forced a passage whence the tor has derived the name of Thirl- <br> stone The E W joints here are not perpendicular but in- <br> cline towards the south ; at Honey-bag Tor near Widdicombe in <br> the moor the inclination is towards the north Near Manaton on a <br> hillside there is a solitary tor Bowerman's Nose rising about 40 <br> feet above a clatter of rocks ; its prismatic shape is probably <br> derived from the intersection of lines of joint These tors have been <br> selected from many as a series of examples of the effect of lines of <br> joint tracing it from the large massive cluster of rocks to the insu- <br> lated pillar Belstone Tors in the hard granite and Hound Tor in <br> the softer granite are probably two of the best points for studying <br> the hues of joint and the different varieties of bedding and decay <br> along the lines of bedding that occur in the east of Dartmoor <br> It has been before noticed that the granite at the northern part <br> of Dartmoor is more crystalline and compact than that to the south <br> of the North Teign ; in the last-named district is the broad belt <br> extending across Dartmoor mentioned in my paper on Rock Basins <br> as containing those hollows Q J G S xv p 16 In this south- <br> eastern division in addition to the other sources of decay is one <br> that arises from the spheroidal structure of the granite Professor <br> Warington Smyth in his Presidential Address for 1868 page 1 <br> mentions that in Palestine blocks of granite decay from the centre <br> to the surface giving rise to rounded hollows That species of 36103124 111288 51125 Page 277 Text v 25 http //www biodiversitylibrary org/page/36103124 1869 Geological Society of London NameFound S xv Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 25 1869 Geology Periodicals Smithsonian Libraries bhl page 36103124 dc identifier http //biodiversitylibrary org/page/36103124 smithsonian libraries Information field Flickr posted date ISOdate 2014-03-06 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/12961600944 2015-08-26 15 53 46 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1869 Photos uploaded from Flickr by FĂŚ using a script | ||||
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