At Corlea, one such drain exposed something quietly arresting: a dense band of twigs and brushwood, compressed into a flat layer roughly three metres wide and just twelve centimetres thick, preserved in the waterlogged darkness of the bog.

The evidence comes from a 1999 investigation by Dunne, which recorded between two hundred and three hundred tightly packed twigs visible in the east face of the drain. Interspersed among them were ten to twelve pieces of brushwood, each around four to five centimetres in diameter, placed at irregular intervals. The same band appeared in the opposite section face to the west, though the material there was less compacted, suggesting some variation in how the structure had settled or survived over time. Notably, none of the wood showed signs of deliberate shaping or jointing, which makes this different from the more elaborate Iron Age toghers, or bog roads, for which Corlea is already well known. A togher is a timber trackway built across boggy ground, and Corlea's principal example, dating to around 148 BC, used large oak planks worked with considerable skill. This find, by contrast, appears to be something simpler: most likely the remains of a platform, perhaps a working surface or a base for activity at the bog's edge, constructed from whatever wood was close to hand.