The evidence is modest but deliberate: a circular pit roughly a metre across, filled with dark, charcoal-rich soil, and at its centre a smaller concentration of red burnt clay and charcoal that suggests the burning happened right there, in place, rather than material being carried in from elsewhere.

The pit came to light in 2003, when archaeological excavation was carried out ahead of a large housing development across two fields. By that point the pit had already been clipped by centuries of ploughing, its upper portion shaved away, leaving only the lower 42 centimetres intact. A second burnt pit of the same general type was found roughly 200 metres to the north-west, and a scatter of other pits turned up across both fields, widely spaced and mostly unelaborated. Burnt pits of this kind are a fairly common find in Irish prehistory and early medieval contexts, though their precise function is often debated; some are interpreted as cooking sites, others as related to craft activity or ritual. The red scorching at the centre of the Grange example points to sustained, concentrated heat at a single spot, though what was being heated, and why, remains an open question.