The name is doing real work here: the two largest stones, one on the north side and one on the south, each weigh enough to make the imagination reach for explanations beyond ordinary human effort. What they actually form is the skeletal remains of a court tomb, a type of Neolithic monument in which a roofed stone gallery was used for communal burial, typically constructed somewhere between four and six thousand years ago.

The structure at Killimor is modest in its surviving form but precise in its layout. The gallery runs roughly east to west, measures four metres in length and just over one and a half metres wide, and is divided into two chambers by a pair of upright jamb stones set only twenty-five centimetres apart. These jambs, standing just over a metre high, once supported a lintel that now lies displaced against the gallery wall. The eastern chamber is the shorter of the two at one and a half metres; the western runs to two and a half metres and is closed at its far end by a backstone standing one and a half metres tall. The entrance faced east. When the eighteenth-century surveying tradition reached this kind of monument in the mid-twentieth century, Ruaidhrí de Valera and Seán Ó Nualláin recorded that the tomb was still surrounded by cairn material, the heaped rubble that originally covered and defined the whole structure, giving it an overall length of fifteen metres and a width of nine. That cairn has since been cleared, leaving the bare stones in what is now agricultural land.

The site sits in recently reclaimed pasture, which means the ground around the stones has been substantially altered over time. The two great orthostats that anchor the north and south sides of the gallery give the clearest sense of the tomb's original scale, and the displaced lintel lying against the gallery wall is worth locating: it shows how the internal division of the monument worked, stone resting on stone, before the structure was partially dismantled or simply fell.