On a plateau at an altitude of 17m OD (SH 2574 8053), a rectangular arrangement of cut features was identified, cut into a natural silt. Immediately to the south was a substantial schist outcrop.
A large number of finds were associated with the features including black chert and flint lithics and early Neolithic ceramics. The building was orientated WSW-ESE and measured approximately 15.2m long and 6m wide. Two parallel rows of five posts, arranged symmetrically about the long axis of the building, formed a central aisle. A slightly
more irregularly pattern of posts and plank slots formed the side and end walls of the building. The structure appears to have been subdivided internally into three separate compartments, a tripartite division of space that is encountered on other comparable Neolithic buildings in Britain and Ireland. The long axis of the structure was
aligned on the Trefignath Neolithic chambered tomb which stands approximately 100m to the NNE and is visible from it through a narrow cleft in the rock outcrop.
The plan and size of the building would be almost identical to that of the Llandygai II building found at Parc Bryn Cegin, except for the eastern bay. These structures seem to have been modular in conception and it is possible additional bays were added either to the original design or in later use if a large building was required.
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