The inner cairn measures roughly eleven metres across and stands just under a metre high, modest dimensions that could easily be mistaken for a natural rise in the land if you did not know what you were looking at. It may once have been kerbed, meaning its edges were defined by a deliberate ring of upright or closely set stones, a feature common to prehistoric funerary monuments that gave the mound a formal, bounded character.

Cairns of this kind belong broadly to the prehistoric tradition of constructing stone mounds over burials or as ceremonial landmarks in the landscape. A ring-cairn, the larger enclosing structure here, typically consists of a circular bank of stones with a more or less open interior, and is generally associated with Bronze Age ritual use. The presence of a separate, smaller cairn placed centrally within that ring is a less common configuration, and it is precisely this relationship between the two structures that makes the Kilbride site worth pausing over. Whether the inner cairn was raised at the same time as the ring-cairn, or added later as part of a continuing use of the same place, is the kind of question that stone alone rarely answers.