Found resting on top of the southern wall of a church enclosure on High Island off the Connemara coast, this cross-slab is incomplete, yet the deep notch cut into its surviving edge is enough to indicate that it once formed part of a cruciform shape. Cross-slabs are among the most common early Christian grave markers found across Ireland, typically flat stones incised or shaped to display a cross, often associated with monastic burial grounds. This one, however, offers almost nothing in the way of ornament. It is plain, irregular, and fragmentary.

The slab is made from garnet mica-schist, a metamorphic rock whose presence on a small Atlantic island speaks to the practical constraints facing early monastic communities who worked with whatever the local geology provided. High Island, known in Irish as Ard Oileán, was home to an early medieval monastery, and the church enclosure where this fragment was discovered is part of that complex. The slab measures just 0.28 metres in height, 0.18 metres in width, and 0.02 metres in thickness, dimensions that suggest either a grave marker for a modest burial or, given its incomplete state, simply what remains of something once larger. It was recorded by Fisher in 2014 as part of a broader study of the island's ecclesiastical remains, and has since been removed from the site and placed in the care of the Office of Public Works at their depot in Athenry, Co. Galway.

Because the slab is no longer on High Island itself, a visit to the island will not bring a visitor face to face with it. What the island does still hold is the broader monastic landscape from which it came, the enclosure walls, the church remains, and the windswept setting that shaped the lives of whoever once marked a grave with this small, notched piece of schist.