The site leaves no impression on the ground that a walker could detect; there is nothing to see, no earthwork, no raised bank, no scatter of stone. What exists instead is a ghost, an arched cropmark visible on aerial photography, where the buried outline of a former structure causes grass or crops above it to grow in subtly different ways, betraying a shape that the soil has quietly preserved.

Cropmarks form when buried features, walls, ditches, or filled pits, affect the moisture and nutrient content of the soil above them. In dry conditions especially, this difference shows up in the vegetation as variations in colour or growth rate, sometimes dramatically visible from the air even when the ground itself appears entirely featureless. In this case, the arched mark suggests a curvilinear enclosure, a form extremely common in the Irish archaeological record and generally associated with early medieval settlement, though without excavation the date and function of the Bloomfield example remain open questions. The aerial photograph that recorded it was taken by the Geological Survey of Ireland, whose systematic coverage of the Irish landscape has brought a considerable number of otherwise undetectable sites into the archaeological record.