That simple fact is, for now, about as far as the paper trail goes. Megalithic tombs are among the oldest surviving human constructions in Ireland, generally dating to the Neolithic period, roughly 4000 to 2500 BC, and built by farming communities who arranged large standing stones and capstones into chambers intended for collective burial. They come in several forms, including portal tombs, court tombs, passage tombs, and wedge tombs, each with its own architectural logic and regional distribution. Which type stands at Derrydonnell More, how complete it remains, and what condition it is in are details that are not currently in the public record.

The townland name itself offers a small clue to the local landscape. Derrydonnell derives from the Irish Doire Domhnaill, meaning Donal's oak wood, suggesting that this part of east Galway was once wooded ground, the kind of environment Neolithic settlers would have cleared for pasture and tillage. That the tomb survives at all, even as an entry without description, is a reminder of how densely Ireland's older landscapes are layered beneath the present one. Thousands of megalithic structures are recorded across the country, yet many remain poorly documented, visited rarely if ever, known mainly as coordinates on a map.