What they were actually used for has generated considerable debate, with theories ranging from cooking sites to communal bathing facilities to hide-working areas. The example at Cranagh in County Wicklow adds a quiet but genuine footnote to that ongoing conversation.

The site came to light not through deliberate archaeological investigation but through the practical disruption of road construction. Gill McLoughlin partially excavated the mound and its associated pits as part of works on the N11 road improvement scheme, a project that, like many large infrastructure programmes in Ireland, produced a steady stream of incidental archaeological discovery. Radiocarbon dating from the excavation placed the Cranagh mound in the late Neolithic or early Bronze Age period, broadly spanning the centuries around 2500 to 1500 BC. That dating situates it within the same broad horizon as hundreds of comparable sites across Ireland, suggesting that whatever activity these mounds represent, it was widespread, repeated, and presumably meaningful to communities living through the transition from the Neolithic into the metal-using world of the Bronze Age. The associated pits are a detail worth noting; they often appear alongside burnt mounds and may have functioned as the troughs or containers central to whatever process the heated stones were serving.