Best one is to HILLBILLY ARCHAOLOGIST where the guy gets out of the Norse Only syndrome and takes a try at translating the materials in Gothic ~ voila, that work dovetails with my own ~ benchmarks!
Since none of us alive walking this earth today, have a living memory of who and when the markings took place, I am not cemented in one particular theory. I do however, lean toward the idea the markings are far older and appear to have more in connection with the numerous other known Norse sites.
In the grand scheme of things what these landmarks tell me is this continent has throughout the course of time had many different peoples spending much time here, long before Columbus sat sail.