The main feature was a boulder known as Giants Rock, which appeared on early Ordnance Survey maps and bore seven cupmarks; circular depressions carved into the stone surface. These ancient markings were arranged in two triangular patterns, with one cupmark standing alone as an outlier. The significance of such geometric arrangements remains a mystery, though similar patterns appear at rock art sites throughout Ireland and Britain, suggesting shared cultural practices among prehistoric communities.

Within a hundred yards of Giants Rock, Kinahan recorded several other carved stones that formed part of this ancient landscape. Due east lay a large flat stone called the Giants Grave, marked with two cupmarks, whilst nearby rock surfaces displayed additional examples of this enigmatic art form. About fifty yards south, a smaller stone bore a single cupmark, completing what appears to have been a significant ceremonial or territorial marker for the area’s Bronze Age inhabitants. These cupmarked stones, typically dating from around 3000 to 1000 BCE, represent one of the most common forms of prehistoric art in Ireland, though their exact purpose; whether ritualistic, astronomical, or territorial; continues to elude archaeologists.

Unfortunately, modern visitors won’t find these ancient artworks where Kinahan described them. The stones were situated in low scrubland near the historic Lough Swilly shoreline, but extensive land reclamation has completely transformed the area. Despite archaeological surveys in more recent decades, including work compiled for the Archaeological Survey of County Donegal in 1983, none of these particular stones have been relocated. Their disappearance serves as a sobering reminder of how easily our prehistoric heritage can be lost to development and changing landscapes, making historical records like Kinahan’s all the more valuable for understanding Ireland’s ancient past.