The designation itself tells you something. Enclosures, in the Irish archaeological sense, are among the most ancient and varied of field monuments, ranging from the circular earthwork raths and ring-forts associated with early medieval settlement to prehistoric ceremonial boundaries whose original purpose remains genuinely uncertain. Which category this particular example falls into, and what survives above ground, remains difficult to establish from any openly available source.

The site has been catalogued as a monument, which means it was identified and assigned a record during systematic fieldwork carried out across the country, but the details that would ordinarily accompany such a record, including any description of its form, dimensions, condition, or date range, have not yet been made publicly available. This is not especially unusual in itself. Mayo is a large county with a dense concentration of archaeological sites, many of them in areas that saw continuous, layered occupation from the Neolithic onwards, and the work of documenting them fully is ongoing. What it does mean, in practical terms, is that Rushbrook's enclosure occupies a quiet corner of the official record, present but not yet legible to the casual enquirer.