No, it's a farily standard (for this area) barnyard wall. Most old barns in this area had them, although many have been torn down, or just collapsed into a pile of rubble. Given that it is essentially hollow, which I didn't fully realize until I tore into it, I don't think it has the strrength to be a foundation. The walls in the local stone houses are not hollow, at least not the ones I've worked on. I have lots of other areas on it that need new mortar too, and I'll have to get to that soon.
I'm thinking it may have been gone over once in the past, perhaps in the 1950's when the house was worked on too, but I can't be sure.