http://earthwise.bgs.ac.uk/index.php?action=history&feed=atom&title=File%3AP519649.jpg 2026-07-03T01:53:04Z Revision history for this page on the wiki MediaWiki 1.42.3 http://earthwise.bgs.ac.uk/index.php?title=File:P519649.jpg&diff=31777&oldid=prev 2017-07-29T15:21:58Z

<p>User created page with UploadWizard</p> <p><b>New page</b></p><div>=={{int:filedesc}}==<br /> {{Information<br /> |description={{|1=Specimen of slate from Glenshee Quarry, Glenalmond, Perthshire, Scotland. The sample is a purple-grey slate with a relatively smooth cleavage surface. Purple slate was also quarried at Glenshee. The specimen is of Precambrian, Dalradian age. British Geological Survey Petrology Collection sample number EMC 1507. Although slate quarrying began in the Logiealmond-Dunkeld area in the 18th century, it reached a maximum during the 19th century. Slate was transported by cart to Perth where it was taken by boat on the River Tay to the coast, to supply markets such as Dundee. Despite the difficulties and expense of transport the quarries were highly succesfull, largely due to the high quality of the slate. The unique visual appearance of Scottish slate is a result of its geological characteristics. Unlike Welsh slate it is generally not capable of being split into smooth regular surfaces. In order to minimise waste, many different sizes of slate were cut resulting in a range of sizes being laid on a roof, termed `diminishing courses?. Specimen size: 12x10cm. P519649.}}<br /> |date=2017-07-29 15:59:54<br /> |source=British Geological Survey<br /> |author=British Geological Survey<br /> |permission=<br /> |other versions=<br /> }}<br /> <br /> =={{int:license-header}}==<br /> {{subst:Custom license marker added by UW}}<br /> {{BGS}}<br /> <br /> [[Category:Uploaded with UploadWizard]]</div>

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