The stream runs underground, below the present peat level, flowing in a southwest to northeast direction through large sub-rounded stones. Above it, nothing visible. Below, a deposit that archaeology tentatively classifies as a burnt spread, which is broadly understood as an area where burning activity took place, often associated in Irish prehistory with fulachta fiadh, or cooking sites, though the interpretation here remains cautious.

The site came to light during pre-development survey work carried out by John Cronin and Associates ahead of a wind farm development at Grousemount by ESB Wind Development Ltd, under licence in 2016. The hollow in which it sits is sheltered, with rising ground to the south, west, and northwest, and the deposit as excavated measured 6.5 metres north to south and 4 metres east to west. Steep slopes to the south meant the dig could not be extended in that direction, though the spread appeared to continue beyond the edge of the opened area. Just east of the hidden stream, a curved arrangement of large sub-rounded stones forms a small arc roughly a metre across, sitting within a charcoal-rich peaty soil and fragmented stone matrix. The charcoal concentration increases noticeably around this arc and in the soil above it. Where one stone was displaced during initial trenching, the deposit was found to reach a depth of around 0.2 metres at that point, a modest but telling layer of accumulated burning.