Three more pics for you:
https://imgoat.com/uploads/a79ea27c27/154665.jpg
https://imgoat.com/uploads/a79ea27c27/154663.jpg
https://imgoat.com/uploads/a79ea27c27/154663.jpg
Edit:
No, it's not nearly that interesting.
I'll tell the story and everyone can see it. I'll type it as a submission and ping you! You can read it at your leisure and comment only if you want to.
That's okay ... you can tell the story sometime, but it's almost nap time for me, so I would lose interest at the moment before I could grasp the historical implications. My guess is though that you likely have an old Norse settlement nearby. I think I saw runes in one of the pictures of rocks you sent. I'm no expert, but that rune did look much like the moniker of Olaf the Scrawny. I'll bet there's quite a tale to be found there if you could hunt down the full runic rock detailing his saga.