I think that's true. Plus, there is no evidence of holes. But its a fantasy I'm very reluctant to abandon as Stonehenge is currently ill-placed and out of scale, lost in the landscape, and Silbury is currently a very unsatisfying ungainly lump, screaming to be complete. Yet both would achieve aesthetic perfection if unified...
Or maybe it was a union issue ?
"Drag them things up there? You got to be jokin' mate - we're on time-an-'alf as it is, we'd want at least another bluestone chip each before we start, and then there's yer oxen - don't climb up 'ills that well, them oxen. Okay on a slope, but up that thing ? Now if you'd said all this at the beginning, we wouldn't have used chalk for a start, and we'd 'ave have made it 'alf as 'igh and twice as wide..."