These structures resonate with our collective unconsciousness - the capstone shape is so familiar - a flat boat, a stone axe, a cupped palm - but is still without meaning.

Is there an online resource which deals with the formalities of dolmen construction ? This is what I have - http://www.themodernantiquarian.com/post/10834 - with what may have been a capstone not far away, downhill, and unphotographed.