The site consists of bare rock slabs interspersed with patches of grass, where at least four sets of ancient markings have been carved into the stone. Three of these rock art panels form a rough north to south alignment; one at the southern end, another in the middle, and a third to the north, whilst a fourth set can be found slightly to the west. The markings rest on an almost flat rock surface that gently slopes southward towards the narrow channel separating the Isle of Doagh from the mainland.

These enigmatic carvings at Magheranaul represent just one example of the rich archaeological heritage found throughout County Donegal. The rock art was first documented by M. R. Colhoun and later included in the comprehensive Archaeological Survey of County Donegal, compiled in 1983. This extensive survey catalogued field antiquities spanning from the Mesolithic Period through to the 17th century, providing invaluable documentation of the county's ancient past.

Whilst the exact age and purpose of these rock markings remain uncertain, they likely date to the Bronze Age, a period when such art flourished across Ireland between 2500 and 500 BCE. The site's location on this tidal island adds to its mystique; accessible by causeway at low tide, it would have been a liminal space between land and sea for the prehistoric communities who created these enduring marks in stone. Archaeological surveys suggest there may be additional undiscovered examples of rock art in the immediate vicinity, making this an area of continued interest for researchers studying Ireland's prehistoric artistic traditions.