A burnt mound is one of Irish archaeology's most mundane-sounding features, yet one of its most persistent mysteries. The basic form, a spread of fire-cracked stone dumped in charcoal-rich soil, turns up repeatedly across the Irish landscape from the Bronze Age onward, and no one is entirely certain what these sites were for. Cooking, industrial processing, bathing, brewing: the theories accumulate. The example at Cherryville in County Kildare, excavated under licence by Thaddeus C. Breen, fits the type in its broad outline but carries enough oddities to hold the attention.

The burnt spread measured 13 metres by 6 metres and consisted largely of fire-cracked sandstone. Beneath it lay a grey silty layer containing fifteen pieces of flint, both worked artefacts and waste flakes left over from tool-making, suggesting some earlier activity at the spot before the mound was formed. To the west, a layer of yellow clay packed with angular unburnt sandstone gave the impression of rough cobbling, though its precise purpose was unclear. Twenty-three pits were found underlying or close to the burnt spread, most of them shallow and oval or round in plan, several with stake-holes in their bases. Two much deeper pits sat at the western edge of the site, each just under two metres across and up to 1.3 metres deep, containing burnt stone, charcoal, and, notably, unburnt animal bones. A stone axehead was recovered during initial monitoring from the ground between the spread and a stream to the south, and a stone lancehead turned up in the fill of a later cultivation furrow that cut across the site, suggesting the field had been worked by spade long after the mound itself had fallen out of use. To the east of the burnt spread, among a scatter of further pits and stake-holes, excavators uncovered a small sunken rectangular structure, 2.6 metres by 1.6 metres, with a post-hole at each corner, as if it had once supported a roof or screen of some kind. Immediately outside it, set upright in the ground, was a single dressed stone. No finds came from the structure, and its relationship in time to the other features on the site could not be established from stratigraphy alone, leaving its function an open question alongside the mound itself.