The site consists of three main sets of rock art arranged roughly north to south, with a fourth set positioned slightly to the west, all carved into the virtually horizontal rock surface that slopes gently towards the channel separating the island from the mainland. These engravings, catalogued as DON 17 in archaeological surveys, showcase the artistic expression of Ireland's ancient inhabitants through a fascinating array of cupmarks, rings, grooves and more elaborate designs.

The western portion of the main carved rock features seven long parallel grooves alongside five cupmarks, two of which display partial rings with tails extending from their centres. Though time has rendered some markings extremely faint on this rougher section of stone, the eastern part tells a different story entirely. Here, the preservation is remarkable, with clearly visible pocked markings including single cupmarks, interconnected cups linked by small grooves, and an impressive disc-cup surrounded by three gapped rings with traces of a fourth. A long, wavy groove meanders down the gentle southward slope, whilst two particularly intriguing designs catch the eye: a small circle containing three parallel grooves, and a complete cartouche enclosing fourteen parallel grooves with forked grooves crossing its southwest corner.

Archaeological surveys have documented these markings since at least the 1980s, with researchers like Van Hoek providing detailed descriptions that help us understand the complexity and variety of designs present at Magheranaul. The site includes an additional row of seventeen short parallel grooves near a small cupmark, though this particular feature is often hidden by overgrowth. These rock carvings, likely created during the Neolithic or Bronze Age, represent one of many such sites scattered across Donegal's rugged landscape, offering tangible connections to the beliefs, rituals, or perhaps simply the artistic impulses of Ireland's prehistoric communities.