A boulder burial is exactly what the name suggests: a substantial, naturally rounded stone raised on supports to cover a pit below, functioning as a kind of low megalithic monument. What makes the pair at Cooradarrigan particularly interesting is not what was found beneath them, but what was not.

Dr W.F. O'Brien excavated both monuments in 1988. The larger of the two, measuring 1.8 metres by 1.6 metres and standing 1.15 metres tall, rests on three support stones over a central pit. That pit yielded charcoal fragments which produced a radiocarbon date of 3080 plus or minus 35 years before present, placing construction somewhere in the Late Bronze Age. Seven narrow stake-holes were found encircling the monument, suggesting some kind of wooden structure or marker once stood around it. The second boulder, a more sub-rectangular stone measuring 1.5 metres by 0.95 metres, sits 3.8 metres to the east, its support stones placed directly on top of a large backfilled pit. Neither excavation recovered human bone or grave goods in direct association with the monuments. The pits were there, the careful arrangement of stones was there, the charcoal was there, but no body, no artefact, nothing that would confirm a burial in any conventional sense. Whether these were cenotaphs, territorial markers, ritual focal points, or something else entirely remains an open question.