What makes the one at Killacolla, in the barony of Shanid in County Limerick, quietly compelling is not what it is but what remains of it, which is almost nothing, and what surrounds it, which was once rather more than anyone knew.

The cairn came to light in September 1989, not through any deliberate search but as a consequence of excavating a nearby short cist, a type of small stone-lined burial box typical of the Bronze Age, found roughly 65 metres to the south-west. Once archaeologist Martin Doody turned attention to the cairn itself, there was little structural detail left to recover. Land reclamation had levelled it almost entirely, leaving only a basal layer of stones sitting on solid bedrock. The landowner, however, recalled what had been there before the ground was worked: a roughly circular mound, somewhere between four and five metres across and about a metre high, rising above the surrounding bog. Doody concluded it was most likely a field clearance cairn, the kind of feature farmers have thrown up for millennia when clearing stones ahead of cultivation, and that it predated the growth of the peat that had eventually engulfed it. A broken hone stone, used for sharpening blades, was recovered from the fill, though its connection to the cairn itself remains uncertain. Doody's survey also noted several other low and peat-covered mounds within roughly 20 to 40 metres of the cairn, suggesting the area once held a small cluster of such features.

Today there is no visible trace of the cairn or any of its neighbours. The site sits in a field of reclaimed pasture, unmarked and largely indistinguishable from the surrounding ground. For those with a particular interest in early agricultural landscapes or the archaeology of bog margins, the context is worth knowing: this is a place where the ordinary work of ancient farming was briefly made visible, then effectively erased a second time, first by peat growth and then by modern land improvement. The records compiled by Denis Power and the published reports by Doody remain the only detailed account of what was once there.