About nine metres across and a metre high, it does not announce itself. A hollow towards its western edge is where the interest lies: three stones, partially exposed, that hint at a structure far older than anything standing nearby. What makes it unusual is precisely this incompleteness, the way the evidence is present but only just, enough to suggest a tomb without quite confirming one.

Wedge tombs are among the most numerous of Ireland's megalithic monument types, generally dating from the late Neolithic and into the Bronze Age, roughly 2500 to 2000 BC. They take their name from a characteristic plan, wider and taller at the west, tapering towards the east, and it is this orientation that makes one of the Knockmaroe stones significant. A single orthostat, a large upright stone forming part of a chamber wall, is aligned WSW-ENE and declines in height from west to east, precisely the pattern associated with the wedge tomb form. Resting against it is a large slab that may once have served as a roofstone but has since been displaced. Beneath that lies a thinner slab, possibly detached from the underside of the larger one. Ruaidhrí de Valera and Seán Ó Nualláin, who catalogued Ireland's megalithic tombs in a landmark multi-volume survey completed through the latter half of the twentieth century, noted the site in their 1982 volume covering Tipperary, identifying it cautiously as a probable wedge tomb despite the scant surviving fabric.

The remains are fragmentary enough that some of the stones visible at the mound's perimeter cannot be attributed with confidence to the original structure. Erosion, agricultural activity, and centuries of casual disturbance have all taken their toll. What survives is essentially a puzzle in stone, three pieces of a chamber that once housed the dead of a community whose name and language have not come down to us.