That uncertainty is not a failure of research so much as its honest conclusion: the feature recorded here exists, in any meaningful sense, only on paper.

The mound at Pallas More first appeared on the Ordnance Survey 25-inch plan surveyed in 1911, where it was marked as a subrectangular raised area, its edges indicated by hachures, the small radiating lines cartographers use to suggest a slope or embankment. Subrectangular earthworks of this kind can, in the right context, point to early medieval activity, enclosures, or burial features, and so it was logged as a potential monument. The difficulty is that the site now lies beneath a massive spoil heap deposited during later river-drainage works along the Inny, and nothing of the original feature is visible at ground level today. Whether the mound predates those drainage operations, or was itself produced by them, remains unresolved. The Inny, a slow midland river running westward through low-lying boggy terrain, was subject to drainage schemes across the nineteenth and twentieth centuries, and the movement of large quantities of earth was routine. A raised, roughly rectangular patch of ground beside a river could as plausibly be a spoil bank from earlier digging as anything older or more deliberate.