This modest yet intriguing site features eleven cupmarks carved into the stone surface, though archaeologist Van Hoek noted in 1987 that six of these are somewhat ambiguous and might actually be natural formations rather than deliberate human creations. The remaining marks, however, show clear evidence of intentional craftsmanship.

What makes this particular site especially noteworthy are the additional decorative elements surrounding some of the cupmarks. One cup is encircled by a complete ring, whilst another features a partial ring carving. Two additional cups initially appeared to have rings as well, but closer examination revealed these to be crudely carved recess bands; a different technique altogether that suggests either multiple periods of use or perhaps different carvers with varying skill levels. The stone also displays several faint grooves that bear resemblance to markings found at other rock art sites in the region, particularly those documented at DON 20.

These cupmarks and ring carvings represent a type of prehistoric art found throughout Ireland and Britain, typically dating from the Neolithic to Bronze Age periods. Whilst their exact purpose remains a mystery, such markings are often found at sites of ritual or ceremonial significance, possibly serving as territorial markers, astronomical calendars, or elements in long-forgotten religious practices. The Magheranaul site, documented by researcher Caimin O'Brien in 2010, continues to intrigue archaeologists and visitors alike as they ponder what compelled our ancestors to leave these enigmatic marks in stone.