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Wallington Hall

Wallington stone

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I posted RockNicker's picture of Duddo stone circle because I thought that was limestone - but it's sandstone like the rest. Burl's quote for the usual material used to construct stone rows 'glacial erratics'. I know of no circles or menhirs that are 'granitic'. A better option is probably to look for a section of rock with these features that has been out of the elements for a large part of the last four thousand years or so.

When you've found said non-existent uneroded stone then you would look minutely for tooling marks. The alternative approach would be to find some putative groove carvings in a dense rock - the Devil's Arrow eg - and then to measure the width of the grooves in Megalithic inches. The answer should be an integral even number. But I must admit I haven't tried that approach with this stone http://www.themodernantiquarian.com/post/5654 yet. It's Millstone Grit so relatively fresh. As well as deep grooves to the left, there's seems to be an engraved figure to the right.

A significant number of the circles of western cumbria, possibly the vast majority, are composed of igneous rocks, shap granite seems to have been the stone of choice in many of the circles along the Lowther/Eden corridor. I would guess that a lot of Aberdeenshire circles are also granite and possibly a number of Cornish and Welsh circles.