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- web.archive.org web/20090922214805/http://…Such burned forts range in age from Neolithic to Roman period. The heating was so extreme that all, some or part of the structures were vitrified or calcined.
- enigmose.com vitrified_forts_scotland.htmlStone enclosures that have come to become called 'Vitrified forts' are scattered about in a relatively small area of Scotland where they have been best documented.
- echoesinthemist.com 2012/06/23/vitrified-forts-of…Robert Schoch, a geologist, after having examined some of these vitrified forts, wrote an article in New Dawn magazine.
- http://logos_endless_summer.tripod.com id139.htmlThe Vitrified Forts of Scotland: How do you vitrify a fort? There have been many theories as to how vitrification has occured in some ancient forts...
- http://entityart.co.uk our-world-in-ruins-melted-…Sections
- Melted Castles / Forts – Europe and Middle East
- Vitrified Forts – Scotland and Sweden
- mattjohnrobinson.com vitrified fortsSet It On Fire, The remains of the ancient Pictish Hill fort Tap O Noth near Rhynie, Aberdeenshire, Scotland. Famed for its vitrified stone walls Stock Photo...
- stolenhistory.net threads/vitrified-fortresses-…A few lines from The Mystery of the Vitrified Forts by Brian Dunning and Uncovering the Secrets of Scotland’s Vitrified Forts: The vitrification is not easy to spot.
- discoveringscotland.com knockfarrel-vitrified-…The fort is known for its vitrified walls, which are made from stones that have been heated to such a high temperature that they fuse together.