It is, in fact, the remnant of a fulacht fia, a type of prehistoric cooking or processing site found in enormous numbers across Ireland, particularly in wet, low-lying ground near water sources. The name is sometimes translated loosely as "deer roast" or "wild deer cooking place", though their precise function has been debated; the most widely accepted theory holds that they were used to heat water by dropping fire-heated stones into a trough, with the shattered, burnt stones then discarded into the characteristic horseshoe-shaped mound that survives today.

What makes this particular example quietly remarkable is not that it stands alone, but that it does not. The Moyny site is one of a cluster of four fulachta fiadh recorded in close proximity to one another, each separated by its own catalogue reference but sharing the same soggy terrain and the same westward stream. That grouping suggests repeated, perhaps sustained use of this corner of West Cork over a long period, or by a community that returned to the same reliable water source again and again. The mound itself is described as low and overgrown, the burnt material that composes it now softened under grass and scrub, the whole thing slowly being reclaimed by the boggy ground that helped preserve it in the first place.