First pic is just a rock. 2nd set of pics is kinda interesting, but those are really old marks. I'm not any good at interpreting treasure marks on rocks though, unless it said 'Dig Here'. Others are. I've heard of metal objects being buried to direct you to a treasure, which I guess they were supposed to come along later with a dip needle and go to where it was buried. Sounds a little involved and far fetched but maybe so. I find a lot of buried metal objects on farmsteads that don't mean nothin. You should do some research on what went on in the area before your time. Nobody else has said it, so I will--KGC. And I'm not advocating any belief in that.