thesweetcheat wrote:
I'm talking about the big stone that can be seen between the two facade slabs, not the (broken) backstone of the big chamber.
If it helps , so we are all singing from the same plan /hymn sheet that central stone is usually referred to as the doorstone . Same as at Trethevy . The one I mean is in the centre of your picture here:
http://www.themodernantiquarian.com/post/114210/zennor_quoit.html
It's the same height as the supporters either side.