That Trethevy quoit was once covered by a mound is indeed an assumption. The presenr inquiry, of necessity due to its astronomical nature, also proceeds on an assumption; that the structure, when in use , was not covered, and further, that it has never been covered. In any case, it must have been free standing before it was covered if it ever was. The discoveries we have made so far are so astounding in terms of solar accuracy that we are in no doubt that its usage as a free standing openwork Solar Structure is proven, and we proceed on that basis.
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