My only point is that if the trench is in the floor of the current tunnel, then it's mostly in natural material, not original Neolithic building material, because the current tunnel floor is beneath the original Neolithic ground surface which the hill is built on top of. I think..
Doesn't look that way to me - in fact EH's diagrams show it to be above ground level and their photos show it to be very white - both indicating Neolithic building material not 'natural material'. Perhaps you have other information to the contrary?
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