Before construction began, archaeologists uncovered a pair of Iron Age ring-ditches at Baldrumman, circular or oval earthwork enclosures that in this period were frequently associated with burial or ritual use. The fact that they were found at all is largely down to the legal requirement for excavation in advance of development, a process that regularly turns up the unexpected beneath what looks like unremarkable ground.

The second of the two ring-ditches, catalogued under excavation registration number E4030, was oval in plan, measuring roughly 13.5 metres on its northwest to southeast axis and 12 metres across the other way. It had a west-facing entrance gap about 2.9 metres wide, suggesting deliberate orientation rather than accidental irregularity. Cremated bone was recovered from the ditch fills, which initially pointed toward a funerary function, but analysis identified the bone as animal rather than human. A charcoal sample taken from the secondary fill, identified as ash wood, returned a radiocarbon date of 60 BC to AD 80, placing the feature firmly in the late Iron Age, a period spanning the final centuries before and the first decades after the conventional start of the Common Era. The findings were published by Russell in 2009.

There is nothing to see at this location now. The site was excavated in advance of development and the service station now occupies the area. What makes Baldrumman worth knowing about is precisely that quality of invisibility. The ring-ditches exist in the archaeological record, documented and dated, while the landscape above them carries on in complete indifference. For those interested in the methodology of developer-led archaeology, the excavation report is the only meaningful access point, and the site itself serves as a reminder that the mundane infrastructure of modern travel is routinely built over ground that repays closer attention.