This particular one is horseshoe-shaped, roughly eleven and a half metres across and less than a metre high, with a central depression running west-northwest to east-southeast. Beneath the turf, traces of burnt stone survive. It is, in other words, a fulacht fia, one of the most common prehistoric monuments in the Irish landscape and also one of the least understood.

Fulachtaí fia (the plural form) are generally interpreted as Bronze Age cooking sites, though other uses, including textile processing or bathing, have been proposed by archaeologists over the years. The typical arrangement involves a trough dug into the ground, a nearby water source, and a mound of fire-cracked stone that accumulated as heated rocks were dropped into the trough to bring water to the boil. The horseshoe shape so familiar from sites like this one is simply the profile left by that discarded stone, building up around the working area over repeated use. What makes the Corrantarramud example quietly interesting is its context: it sits approximately 80 metres southeast of a second fulacht fia, and a third comparable monument lies around 50 metres to its own southeast. Whether these three sites were used simultaneously, in sequence, or by different communities across a span of centuries, the ground does not say. Clusters like this are known elsewhere in Ireland, but the reasons for them remain a matter of ongoing discussion among specialists.