Inside, there appear to be two or three pits. On its own, that description might suggest a prehistoric ring-ditch, a form of monument often associated with burial or ceremonial activity, sometimes all that survives above the ploughsoil of a once-prominent earthwork.

The complication is in the detail. The fosse appears to cut across a set of cultivation ridges running roughly east-north-east to west-south-west, ridges that themselves run parallel to the existing field boundaries in the area. If the enclosure post-dates those ridges, it is more recent than it might first appear, and possibly has nothing to do with prehistory at all. A relatively modern origin, perhaps a stock enclosure or a small managed feature within an agricultural landscape, cannot be ruled out. That uncertainty is what makes Rosspile quietly interesting: the survey (referenced as 20R0129 in a 2020 report by Nicholls) identified the feature clearly enough, but stopped well short of resolving what it actually is or when it was made. The landscape around it continues to be farmed in broadly the same orientation it has been for generations, and the enclosure sits within that continuity, neither fully explained nor dismissed.