http://earthwise.bgs.ac.uk/index.php?action=history&feed=atom&title=File%3AP519578.jpg 2026-07-03T00:05:37Z Revision history for this page on the wiki MediaWiki 1.42.3 http://earthwise.bgs.ac.uk/index.php?title=File:P519578.jpg&diff=31743&oldid=prev 2017-07-29T14:53:20Z

<p>User created page with UploadWizard</p> <p><b>New page</b></p><div>=={{int:filedesc}}==<br /> {{Information<br /> |description={{|1=Specimen of Ballachulish Slate from East Laroch Quarry, Ballachulish, Argyllshire, Scotland. Large cut and dressed slate specimen of Ballachulish Slate, presented to the Geological Survey of Scotland sometime before 1911. The specimen is of Precambrian, Dalradian age. British Geological Survey Petrology Collection sample number EMC 5754. Scottish slate was produced in a number of sizes, and generally graded into three catagories,&#039;sizeable&#039;,&#039;undersized&#039;and&#039;peggies&#039;. This full-sized slate would be classed as sizeable. Because most Highland slates contain the mineral pyrite, the dressing of slates was a labour-intensive job, and whole villages sprung up around the quarries, generating a living for hundreds of families. The skills of the slate workers were great, and passed down the generations from father to son. The Scottish style of slate roof is different from that in England and Wales which generally use a single standard size of slate. A Scots slate roof may use up to thirteen different sizes of slate, laid in a style known as diminishing courses. This is important in defining the character of the built heritage in Scotland. P519578.}}<br /> |date=2017-07-29 15:51:08<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>

Scotfot