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Your're right it is Fernworthy, but it comes up under Ireland - Castleruddery stone circle, and Rupert Soskins mentions Fernworthy..

http://www.themodernantiquarian.com/site/1257/castleruddery.html

The slots and drilled holes on this site are the ones he was looking at, one stone seemed to have been drilled to split, (equally spaced drilling holes) but the slotted ones seemed different....

aah.
Thanks to your Fernworthy tipoff I have spotted this (scroll down to page 10)
http://www.dartmoor-npa.gov.uk/au-archpt4.pdf
which is about 'tare and feather' and 'wedge and groove' methods of splitting stones on Dartmoor. That looks more like it doesn't it.

moss wrote:
Your're right it is Fernworthy, but it comes up under Ireland - Castleruddery stone circle, and Rupert Soskins mentions Fernworthy..

http://www.themodernantiquarian.com/site/1257/castleruddery.html

The slots and drilled holes on this site are the ones he was looking at, one stone seemed to have been drilled to split, (equally spaced drilling holes) but the slotted ones seemed different....

Another site in Kildare that shows the same kind of markings, they are know in folklore as the paw prints of the hound of cuchailainn.

http://www.themodernantiquarian.com/site/8194/brewells_hill.html

I know castles in ireland often have gaps left in the stonework where timber poles could be inserted and turned in scaffolding.
Just a thought I had when you mentioned rectangular holes in stones.