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Welsh cromlechs

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Nuts ...

and how do you cover this?

http://www.megalithomania.com/show/site/933/2807

This is nearly as tall as the chamber in Newgrange. It would need a 60m diameter mound to cover it in a stable manner. Pentre Ifan would need a cairn 35m across.

or

Trethevy or http://www.themodernantiquarian.com/post/21304 or http://www.themodernantiquarian.com/post/29934 ?

...but like you said, they needn't have been entirely covered. So long as the sides were consumed by the cairn (or theoretical cairn) then the tomb would be... er... tomb-like.

Without some sort of material around the sides, there would be nothing to stop people or animals from squeezing in through the gaps. I'm not sure that this would necessarily be a problem though.

Now I'm confused!

K x