Just as the earthworks and wooden structures within the Avebury monument complex were changed over time so some of the stone settings were altered slightly.
Stone 41 is an example. A larger stone was replaced by a smaller one, and a fragment of human bone dated to the period 2000-1700BCE was recovered from the infill in the original stone-hole.
The Ringstone likewise replaced some earlier stone.
Near the northern portal the positions of three former stones known as A, B and C are marked with concrete posts. These may have pre-dated the Great Circle and appear to have been removed in order to construct it.
The Beckhampton Cove of four stones in a trapezoidal formation replaced a pre-existing setting of three stones in a row.
Stones were removed and replaced/repositioned at the start of the Kennet avenue when the dog-leg was created.