What defines it is a degraded earthen bank with an external fosse, meaning a ditch running around the outside rather than within, and no visible entrance breaks the ring at any point. That last detail is worth pausing over. Most enclosures of any practical purpose, whether for livestock, defence, or ceremony, need a way in.

The absence of an entrance, combined with its setting within designed parkland, points toward a particular and rather elegant explanation: a tree-ring. These were ornamental circular plantings, fashionable in the landscaping of Irish and British estates from the eighteenth century onward, where a bank and outer ditch would be thrown up to protect and frame a ring of trees, often beech or oak, intended as a visual feature in a managed landscape. The earthwork was never meant for people to enter; it was meant to be looked at, to punctuate a view or anchor a stretch of open ground. Over time, as estates fell into decline or changed hands, the trees might be felled or simply die back, leaving only the earthwork as a faint signature of someone's careful aesthetic intention. Whether that is precisely what happened at Tinode is not certain, hence the cautious "possibly" that attaches to the identification, but the combination of circular form, external fosse, and parkland context makes it a credible reading.