A statistical question: what are the chances of a broken (votive?) bronze age axe turning up at the base (indeed, in the "moat") of a mound that isn't Bronze Age?
Rare - its out of context for a start, more like disturbance at a later date, roman intrusion, so you still come back to where you started. Its that juxtaposition of it being at the bottom of a hill next to marshy and presumably boggy ground that doe'snt strike right, only excavation is going to tell. Silbury is a one-off like Stonehenge, a single vision at a particular time....
