Measuring approximately 2.3 metres long and 1.1 metres wide, this prostrate slab bears two distinctive cup-marks on its weathered upper surface; small, circular depressions that hint at ancient human activity. Despite its current horizontal position, this stone appears to be the same monument marked as a 'Standing Stone' on the first edition Ordnance Survey six-inch map, suggesting it may have once stood upright before toppling at some point in its long history.

Cup-marks like these are amongst Ireland's most enigmatic prehistoric features, typically dating from the Neolithic to Bronze Age periods (roughly 4000 to 500 BCE). These shallow, bowl-shaped indentations were deliberately carved into stone surfaces, though their exact purpose remains a mystery to archaeologists. Some theories suggest they held ritual significance, perhaps used for offerings or as part of ceremonies marking seasonal changes or important events. Others propose more practical uses, such as grinding stones or markers for astronomical observations.

The stone's location in bogland is particularly interesting, as many of Ireland's archaeological treasures have been preserved by or discovered in peat bogs. The surrounding landscape of craggy ridges would have provided both shelter and vantage points for prehistoric communities, whilst the bog itself may have developed long after the stone was first erected. This fallen monument serves as a tangible link to Donegal's ancient past, when the landscape was inhabited by people who left their mark, quite literally, on the stones they encountered.