Zuma,
Thanks for the info.
I did a bit of research on the Great Lakes Trail tree Society website and this is what their website said about trail marker trees.
Trail Marker Trees are trees that were shaped into a specific form by man to be easily recognized and then used to aid in land and/or water navigation as well as to mark significant Native American sites. These trees would help guide Native Americans along the safest route in their journeys and would direct them in finding a variety of natural resources necessary for their way of life.
The Trail Trees are most commonly formed from trees in the hardwood family (i.e. Oak, Maple, and Elm) because of their flexibility while young and their longevity after being formed. I also learned that some trail marker trees were formed by non Native Americans. Their website is quite interesting.
Regardless of the unknown (Native or Non Native) person who formed it or what it marked it is very special to me.
Take care,
Brian