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2017-07-29T15:21:52Z

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|description={{|1=Specimen of slate from 5/16 mile north of the summit of An Aird, 2.75 miles south-west of Tayvallich, Argyllshire, Scotland. The sample is a Tayvallich slate, which is a dark slate quarried mainly for local use. It can be seen today on the roofs of many older buildings in the Tayvallich area. Stratigraphically it belongs to the Loch Awe Slate Group, Dalradian Supergroup (Precambrian) in age. British Geological Survey Petrology Collection sample number EMC 855. The use of'local'slates such as this is what defines local and regional character in the built heritage of Scotland. It is important to try to maintain this diversity of material, but this is becoming increasingly difficult as local sources of slate are no longer worked. Indeed since the 1950s there are no commercial roofing slate quarries operating in Scotland. Previously much second -hand slate has been used for the repair of historic buildings. For example the roofs of Glasgow tenements and former industrial buildings such as Dundee?s jute works provided much material. However, second-hand Scottish slate is now increasingly difficult to obtain, and there is a threat of an illegal `black market? developing. It is known that some traditional buildings of lesser quality have suffered as a result of the increased demand for second-hand slate, and there is a real risk of an erosion of the traditional building stock. Specimen size: 10x9cm. P519645.}}
|date=2017-07-29 15:59:53
|source=British Geological Survey
|author=British Geological Survey
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Scotfot: User created page with UploadWizard