These are of historical importance because of their multi-stage construction which provides evidence for the development of Clyde cairns at the beginning of the Neolithic period.

Mid Gleniron I was revealed to have been originally two separate, small (5m diameter) rectangular cairns, each with entrances into single chambers.

[7]: 105  Thomas notes the close positioning of these two cairns implies that it was anticipated that they would be incorporated into a larger construction.

[7]: 111 Historic Environment Scotland's Statement of National Importance for the site notes its potentially international significance for shedding light on "the sequence and development of funerary and ritual architecture during the Neolithic and early Bronze Age.

"[1] Excavation at Droughdool Mote between 1999 and 2002 revealed a round cairn at the top of the mound, similar in construction to Mid Gleniron A.