[1] The landward side of the knoll is bounded by precipitous rock faces except on the southeast where a small cleft was used for an outer gateway.

[1] Dun Ardtreck was excavated by Euan W. MacKie in 1964-5 as part of an exercise to establish the development of the broch.

[1] Dun Ardtreck is a D-shaped structure with the straight side formed by the edge of a high cliff, along which a narrow wall ran.

The height of the wall at the cliff edge is about 6 inches but it rises to several feet at the entrance passage, which faces inland; the structure was built on the rock surface sloping inland from the cliff edge, a rubble platform forming the foundation..

The primary occupation of the dun was a relatively thin floor deposit inside, on which some burnt material lay, implying destruction by fire.