Orkney 49
Image by Moth
Orkney

for wideford

A fine guess would be rather than folk from elsewhere donating stones to the Ring of Brodgar it was a case of their stone circles being cannabilised for it from force majeur. Also there are strong hints that some small stone circles may have become buried under later features.

Oh, and with short-arse circles they could well be buried under the peat and not found because we have still not re-colonised areas of settlement from warmer periods.