I just got back from a whistle-stop tour of the south west. All over Cornwall in particular I saw field boundaries constructed with huge flattish stones standing upright. For example at the Merry Maidens circle the field boundary is just such a wall and at one point there are some horizontal slabs on top of the verticals rather reminiscent of a quoit. It made me wonder how many prehistoric structures were either incorporated into or raided for field boundary material. Some of the stones were so big that I wondered whether any post-megalithic culture would have bothered to move them.
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