Discovered quite by accident in 1978 during quarrying operations, this prehistoric monument sits 50 metres from the northeastern end of a northwest to southeast aligned ridge. The cist, found more than a metre beneath the ground, had suffered severe damage over the millennia, with only its capstone remaining in place when archaeologist O'Kelly arrived to investigate.

What O'Kelly uncovered was intriguing, if incomplete. Based on the surviving evidence, he pieced together what appeared to be a square burial chamber, originally constructed from five stone slabs standing on edge; two forming one side, with single slabs completing the other three walls. The floor consisted of a single paved stone, whilst the capstone that once sealed the chamber measured approximately 1.2 metres by 0.6 metres. The ancient builders had gone to considerable effort, digging a deep pit specifically to house this stone coffin.

Inside this carefully constructed tomb, archaeologists found the cremated remains of a single adult, aged between 25 and 30 years. Though the sex couldn't be determined from the bones, the careful burial of this individual speaks to the reverence with which prehistoric communities treated their dead. Curiously, no grave goods or artefacts were discovered alongside the remains, leaving us to wonder about the identity and status of this person who was laid to rest on a Donegal ridge some three to four thousand years ago.