This is a wedge tomb, a type of megalithic burial monument built during the late Neolithic and early Bronze Age, characterised by a covered gallery that typically tapers in both height and width from one end to the other. The example at Carriganimmy follows that pattern precisely: the sidestones diminish in height as they run from west to east, giving the structure its distinctive wedge profile.

The gallery itself is modest in scale, roughly 4.7 metres long and only about 0.6 metres wide, aligned along a WNW-ESE axis and enclosed by outer walling. Three roofstones cover the interior, and a loose slab at the eastern end may be a fourth that has shifted from its original position. The ground inside the gallery appears to have been dug out at some point, and the low mounds of earth visible to the north and south of the structure are likely the spoil from that disturbance. Whether the digging was the work of antiquarians, treasure-seekers, or something more casual is not recorded. What is clear is that the monument, though compromised, retains enough of its original fabric to read as a coherent structure. Adding a quiet layer of context to the site is the presence of another wedge tomb approximately 800 metres to the north-east, suggesting this stretch of the Keel River valley was meaningful ground for the communities who built here.