A cashel is a type of ringfort enclosed by a stone rather than earthen bank, and this example sits quietly in pasture on the demesne lands of Rockbarton House, roughly 300 metres to the north of that estate. What makes it stranger still is its company: within 160 metres to the northwest lies an unclassified megalithic tomb, and 45 metres to the south sits a prehistoric burial site, making this corner of a Limerick field one of the more quietly concentrated archaeological landscapes in the region.

The cashel was recorded by the archaeologists Seán P. Ó Ríordáin and John Hunt in 1942, who catalogued it as 'Fort 4' in their survey. They described a large fort with stone banks approximately 55 metres in diameter, with what appeared to be a house and other structural features surviving within the interior. Despite that record, it was never marked on the standard Ordnance Survey maps, either the six-inch edition or the later 25-inch series. The 1840 six-inch map does show field boundaries crossing through the area, running roughly northwest to southeast and east-northeast to west-southwest, though these had disappeared from the 25-inch revision. The monument's circular outline, enclosed bank, and interior features remained visible on aerial orthophotography taken between 2005 and 2012, and on Google Earth imagery captured in September 2020. A further field boundary, possibly linked to the landscaping of the Rockbarton demesne, is visible on more recent imagery intersecting the cashel at its northeast side.

The site sits in the southeast quadrant of a wider field system and is private farmland, so access would require landowner permission. It is not signposted, nor marked on any publicly available mapping. Those interested in visiting would do best to consult the National Monuments Service record and cross-reference with satellite imagery to identify the approximate location before making any enquiry. The cashel is most legible from aerial views, where its circular form is clearer than it would be at ground level in long grass or winter pasture.