Walk the pasture today and you would find nothing, no earthwork, no raised bank, no visible trace. The site survives only in the cartographic record, mapped twice at intervals of nearly a century, each time with slightly different dimensions, each time confirming that something is there, even as the ground refuses to show it.

The Ordnance Survey's six-inch map of 1839 recorded the feature as a roughly circular embanked enclosure with an external diameter of around 50 metres, its boundary folded into the townland boundary between Tinnabaun and Pallishill along its south-eastern and south-western edges. An embanked enclosure of this kind is broadly understood to be a defined area, most likely of early medieval or prehistoric origin, demarcated by a raised earthen bank rather than a ditch. By the time the OS revisited the area for its 1924 edition, the picture had grown more complex. The enclosure was now described as D-shaped, measuring approximately 70 metres east to west and 65 metres north to south, its southern edge cut off by the townland boundary and its eastern side interrupted by a north-south field bank. Whether the enclosure genuinely changed in perceived shape between surveys, or whether the later cartographers simply had better information or a different vantage, is difficult to say. The site sits on a shelf near the top of a north and north-west facing slope, a position that would have made reasonable sense for an early settlement or enclosure, offering prospect over the lower ground without full exposure to the ridge.

What makes Tinnabaun quietly interesting is precisely this gap between the documentary and the physical. The maps insist on a structure; the field gives nothing back. It is possible the enclosure has been so thoroughly levelled by centuries of agriculture that its banks have merged imperceptibly with the surrounding ground. It is also possible that further investigation, whether geophysical survey or careful aerial photography under the right conditions, would reveal the outline still lurking just below the surface.