http://earthwise.bgs.ac.uk/index.php?action=history&feed=atom&title=File%3AP519598.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:P519598.jpg&diff=31762&oldid=prev 2017-07-29T14:53:47Z

<p>User created page with UploadWizard</p> <p><b>New page</b></p><div>=={{int:filedesc}}==<br /> {{Information<br /> |description={{|1=Specimen of roofing slate from Aberfoyle Slate Quarries, Perthshire, Scotland. Distinctive banded slate with alternating purple and greenish grey colours, termed&#039;tartan variety&#039;. The specimen is of Precambrian, Dalradian age. British Geological Survey Petrology Collection sample number EMC 5773. The different colours are caused by from the presence of alternating sedimentary beds which have slightly different compositions. During metamorphism, this results in the formation of different types of iron oxide minerals within different beds, some having a purple-red colour, whilst others are grey. The Aberfoyle tartan slate may have been used as a marketing feature for Scottish slate, but it is not known how commonly it was actually used as a roofing material. P519598.}}<br /> |date=2017-07-29 15:51:40<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