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| Keywords: The Quarterly journal of the Geological Society of London (12736565135).jpg ASSOCIATED ROCKS OF THE LIZARD DISTRICT <br> 899 <br> Cadgwith village to the level of the main plateau above the sea we <br> again find the serpentine A quarry here in 1876 showed the <br> junction with the schist very well The former rock overlay the <br> latter which had a dip of some 30° with a rather irregular junc- <br> tion ; but here as in other cases it seems to have generally forced <br> its way fairly evenly along the plane of bedding The serpentine <br> no 6 is very compact in texture and varies from a claret-colour <br> to an olive green both varieties being veined and mottled the <br> former with dull green and bright red the latter with a purplish <br> tint ; occasional layers of greyish-green steatite occur <br> The serpentine in the cove beyond is mottled light and dark <br> green This rock now continues to form the cliffs above the sea for <br> some distance About half mile from Cadgwith measured in a <br> straight line the shore is strewn with huge boulders and overhung <br> by cliffs of a dark serpentine This rock is almost as black and <br> compact as that of George Cove ; but the surface is varied by a vein- <br> like mottling of very dark olive-green and by bronzite crystals <br> about 0 2 inch wide with a bright submetallic lustre no 10 ; it <br> weathers a dull earthy green <br> Some 100 yards from this spot along the shore we reached an <br> apparently faulted junction of the serpentine and hornblende schists <br> Directly after the serpentine sets in again overlying the other rock <br> following nearly the plane of bedding The hornblende schist is <br> extremely altered ; some bands in it are in colour and texture very like <br> ordinary vein granite ; but after most careful examination I feel <br> convinced there is no true granite here The ends of the strata are <br> bent over on the southern side ; and in the lower part a coarse <br> breccia of schist and serpentine separates the two masses of these <br> rocks There is a similar breccia though less irregular on the <br> other side where the base of the serpentine is greatly decomposed <br> the rock assuming an earthy aspect of a mottled dull greenish or <br> reddish grey colour veined with indian-red having scarce any re- <br> semblance to normal serpentine A little further on are four <br> masses of hornblende schist one after another along the shore <br> caught up in the serpentine fig 5 Parts again of these are <br> Fig 5 ” Masses of Hornblende Schist included in Serpentine <br> The serpentine indicated by fine wavy lines <br> b Schist bedding nearly vertical c Tongue of serpentine <br> d Schist bedding nearly horizontal highly altered 35819094 110705 51125 Page 899 Text 33 http //www biodiversitylibrary org/page/35819094 1877 Geological Society of London Biodiversity Heritage Library The Quarterly journal of the Geological Society of London v 33 1877 Geology Periodicals Smithsonian Libraries bhl page 35819094 dc identifier http //biodiversitylibrary org/page/35819094 smithsonian libraries Information field Flickr posted date ISOdate 2014-02-24 Check categories 2015 August 26 CC-BY-2 0 BioDivLibrary https //flickr com/photos/61021753 N02/12736565135 2015-08-26 20 02 10 cc-by-2 0 PD-old-70-1923 The Quarterly journal of the Geological Society of London 1877 Photos uploaded from Flickr by Fæ using a script | ||||
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