Can someone with the book just let us know what it has to say on the matter? I don't fancy forking out 70 quid just for half a page of possibly inconclusive information.
What I did find interesting from your two web links was that the bedrock is chalk. I wonder what depth of sediment lay above the chalk when the monument was built. There was mention of a pavement being discovered. That ought to give some idea of the original level. Although chalk isn't particularly strong, it's is likely to be a good deal stronger than the clayey loam in my back garden. My guess is that an 8 foot pit in chalk would arrest the roating column quite nicely, with maybe just a bit of fracturing near the top.
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