Silbury Hill 180
Image by thesweetcheat

Littlestone wrote:
But getting back to speculation on the presence of the sarsen boulders found within Silbury, we could just say that they were placed there for structural reasons - then again (given their size) we might also say they were carried there (perhaps from all over the country) in a final gesture of respect for a departed one. And in so doing adding to an accumulated statement of a unified identity - something like a cenotaph perhaps?

It's not, after all, dissimilar to what we do today at Westminster Abbey where the remains of the good, famous and fallen are laid together in a unified statement of 'us'.

Non utilitarian aspects of monuments need explaining and sometimes the explanations become reified until new information confirms or negates the idea . radio carbon dating on a gross scale transformed the conjectural world that had a Mycenean inspired Stonehenge and standing stones and tumuli being the graves of danes .
Better quality dating and use of Bayseian stats produces dates that are accurate to less than a generation ,in the circumstances this info is starting to make the “ancestors “ a bit creaky and something more appropriate may have to replace it ,certainly for the sites that have the necessary dates and possibly for others that fit into the original paradigm. If there is a rethink on the ancestor idea in relation to chambered tombs etc Silbury would not be affected as it is different type of association ,the other are all deposits not anthromorphisation .A bit late now but it's worth considering what might have confirmed or refuted the idea ? e.g. faces would help a pro vote .

...e.g. faces would help a pro vote .
If by faces, Mr t, you're suggesting people went and looked for a (small) boulder, or stone, in which they 'saw' the face of a departed one, and that stone then came to represent the departed one and was either kept at home (as I think Branwen might be suggesting above) or taken to a communal 'cenotaph' then yes, that would help in a pro vote for the small Silbury boulders possibly representing those who have past away.

'Faces' in the pit-marked sarsens (of all sizes) found in Wiltshire can quite easily be seen if you look at them long enough (there's a smiley face with a stubby nose in the central stone here - http://www.themodernantiquarian.com/img_fullsize/65185.jpg if you tilt your head to the left :-) The absence of such faces however doesn't necessarily mean that stones didn't represent a lost one, or that they weren't placed at Silbury for reasons other than mainly structural ones.