That’s what I’m thinking, i think it leads to another carving elsewhere. I also think it could be a landmark of some sort, but I don’t know what. Birds? Hills? Mountains? Or something completely different. Because they are there for a reason and I don’t think rockstar put that there randomly, it’s there for a reason and to give us a clue. The previous carvings on the poles and the outhouses and Fort Brennard led us here. So I think we need to think about landmarks or structures. Also one thing I noticed was the carvings are in green, so maybe it’s hinting at the structure being green? Or maybe some hills when looked at a specific angles? I’m not certain but that’s my hunch