It would have been easy to overlook, and in other circumstances might well have been. What the excavators had found was a burnt mound, one of the most widespread and quietly puzzling monument types in the Irish prehistoric landscape.

Burnt mounds are exactly what they sound like: accumulations of stone that has been repeatedly heated and then plunged into water, causing it to crack and splinter. The process leaves behind a distinctive deposit of heat-shattered fragments, typically banked up into a mound beside a trough or hollow. They are found in their thousands across Ireland and Britain, dating broadly to the Bronze Age, though their precise function has never been settled to everyone's satisfaction. Cooking, bathing, textile processing, and various industrial uses have all been proposed. The Grange example came to light in 1993, when pre-development testing revealed the remains of a deposit measuring 0.68 metres in length and 0.82 metres in width, comprising exactly that characteristic layer of thermally fractured stone. The find was recorded by O'Carroll in 2006 and compiled as part of the Dublin archaeological record by Geraldine Stout.

Given that this site was identified through pre-development testing, it is likely that little or nothing survives above ground today. Sites of this kind rarely present themselves as visible features in the modern landscape; they tend to be encountered in section, during groundworks, rather than as anything a walker would notice. The value of a find like this is less in what a visitor might see and more in what it adds to the broader picture of prehistoric activity in the Dublin area, confirming that ordinary Bronze Age life, whatever form that took here, once played out on this patch of ground.