Between 1838 and 1908, quarrying operations gradually ate away at both the ridge and the archaeological monument that crowned it. What was once depicted on early Ordnance Survey maps as a rectangular shaped earthwork, described in field name books as an 'ancient fort', has largely vanished beneath furze bushes and the scars of industrial extraction.

Historical records paint a picture of what once existed here. The 1838 Ordnance Survey six-inch map shows a rectangular enclosure that suggests this was originally a moated site, similar to two others located within a kilometre of this spot. When the Offaly Historical and Archaeological Society surveyed the area in 1974, they could still make out traces of an enclosure or bailey to the south, remnants of a mound to the northwest, and evidence of an encircling bank and fosse. These features likely represent a medieval fortification, possibly dating from the Anglo-Norman period when such moated sites were commonly built across the Irish midlands.

The transformation from archaeological monument to quarry pit reflects a common fate for many earthworks situated on valuable geological resources. By the time the revised 1908 Ordnance Survey map was produced, the site was marked simply as a disused gravel pit. Today, the earthworks that remain are largely the result of quarrying upcast rather than medieval construction, making it difficult to distinguish between what was ancient fortification and what was nineteenth-century industrial activity. The site serves as a reminder of how Ireland's archaeological heritage has often been sacrificed to more immediate economic needs.