Someone, at some point, wrote the words "small cairn" on a map, and that two-word note was enough to earn the spot a formal listing in the Record of Monuments and Places in 1996. The annotation was made by a man named Tom Coffey, though the circumstances of his observation, whether a careful survey or a passing glance, are not recorded.

A cairn, in the most general sense, is a mound of stones, often prehistoric in origin, built over a burial or used to mark a significant point in the landscape. When inspectors visited the Fahee site in 1999, what they found was something considerably more ambiguous: a low, heather-covered mound, subcircular in shape, with no visible stone whatsoever. The cairn, if it ever was one in the conventional sense, had either been reduced over centuries of weathering and agricultural activity, or was always something more modest than the word implies. The site sits within a relict field system, the ghostly outlines of ancient land boundaries that survive in the rough pasture around it, which at least suggests the area was once actively worked and inhabited. The views east from the hill are wide, and the positioning on a shoulder of elevated ground is the kind of deliberate placement that does tend to mark prehistoric monuments. But deliberate placement and a heather-covered lump are not, on their own, confirmation of anything much.

What the Fahee cairn illustrates, quietly, is how the archaeological record is built and maintained. A scribbled map note becomes an official listing; an official listing prompts a site inspection; the inspection finds almost nothing, but the listing remains, because absence of evidence is not quite the same as evidence of absence. The mound sits in its pasture, heather-covered and unhelpful, neither confirming nor denying what Tom Coffey once thought he saw.