What makes it quietly puzzling is that nobody is entirely sure what it is. Depending on which set of aerial photographs you consult, it looks either like a prehistoric enclosure or an old quarry, and the record holds both possibilities open without resolving them.

The feature first appears on the 1840 edition of the Ordnance Survey six-inch map, where it is drawn as a circular earthwork with a diameter of around 46 metres. That early cartographic depiction suggested something deliberate and enclosed, the kind of shape associated with prehistoric activity in the Irish midlands and south. When the Bruff aerial photographic survey revisited it in 1986, the monument was recorded as roughly oval. More recent orthophotos from Digital Globe, taken between 2011 and 2013, and Google Earth imagery from June 2018 show a sub-oval form measuring approximately 75 metres on its north-east to south-west axis and 42 metres across. Between those two sets of imagery, however, OSi orthoimages from 2005 to 2012 produced a different reading altogether, one in which the feature resembles a quarry rather than any kind of archaeological enclosure. Adding a further layer of interest, a ring-barrow, a type of low circular burial mound typically dating to the Bronze Age, lies about 140 metres to the east-north-east, which hints at prehistoric activity in the wider landscape even if the earthwork itself remains unclassified. The record was compiled by Alison McQueen and Vera Rahilly and uploaded in August 2020.

The site sits in working agricultural land, so access is not straightforward and permission from the landowner would be needed before approaching on foot. The earthwork is not marked or interpreted on the ground, and visitors would need to orientate themselves carefully using the townland boundary with Knockfennell as a reference point. Because the feature is most legible from above, the aerial imagery available through Google Earth is genuinely useful for understanding its shape before or instead of a visit. Those with an interest in landscape archaeology will find the ambiguity itself worth noting: the difference between a prehistoric enclosure and a post-medieval quarry is not always obvious, even to specialists working from the same ground.