This is a leacht, a type of votive or commemorative cairn associated with early Irish Christianity, typically built to mark a saint's grave, a place of prayer, or a site of local pilgrimage. They are not uncommon in early ecclesiastical settings, but they are frequently overlooked, mistaken for field clearance heaps or the remnants of later structures.

The Roscam example sits within a wider early ecclesiastical enclosure, the kind of curving boundary that hints at a monastic or devotional settlement of considerable age. The leacht itself measures 3.65 metres north to south and 2.8 metres east to west, rising to a maximum height of 1.1 metres. What makes the surviving sections distinctive is their construction: the boulders on the western and northern sides are laid in regular courses, with a massiveness that has been described as cyclopean in character, meaning the stones are so large they suggest a deliberate, almost monumental effort. One boulder on the western side alone measures 1.2 metres long and 0.45 metres high. The interior is now strewn with collapsed material, and the eastern and southern faces have largely disintegrated, their stones lying where they fell.

The structure is classified as a possible leacht, a qualification that reflects genuine uncertainty. Without excavation, it is difficult to distinguish a purpose-built devotional cairn from other stone accumulations, and Roscam's graveyard has seen use across many centuries, complicating any reading of individual features. The well-preserved western wall, however, with its careful coursing and sheer scale of individual stones, suggests something more deliberate than casual dumping or later disturbance.