The centrepiece of this collection is a medieval cross-slab, measuring 1.35 metres tall and 45 centimetres wide, which has been cemented directly to the graveyard wall behind it. Time hasn't been entirely kind to this ancient monument; the top shows signs of damage, and at some point the slab split down the middle before being carefully rejoined.

This cross-slab represents just one of many archaeological treasures documented across County Donegal during comprehensive surveys of the region's field antiquities. The original recording of this particular monument, catalogued as entry number 1620, formed part of an ambitious project to document everything from Mesolithic sites through to 17th-century remains throughout the county. The survey work, compiled by Brian Lacey and his team of archaeologists in 1983, has since been revisited and updated by researcher Paul Walsh, ensuring that these important historical records remain accurate and accessible.

The altar's position within the graveyard, combined with the deliberate placement of the cross-slab and other stone items, suggests this spot held particular significance for the island community. While the exact age and original purpose of the cross-slab remain subjects for further study, its careful preservation and prominent display speak to its enduring importance as part of Tory Island's rich archaeological heritage.