The rings at Yellowmead were discovered in 1921 when covering heather was burnt off during a drought, the rings were re-erected that autumn using local labour.
This large scale reconstruction may explain why the four nested rings are now non-concentric, or perhaps, the reason may lie in the distant past, as it is probable that the outer rings were later additions to an existing monument.
The inner ring was probably filled by a cairn, as the large, almost contiguous stones of this ring look very much like the kerbs that would have encircled such a mound.