Steve, your accounts of the Iron Door seem to match what I have read. When I was OK (Tulsa) I bought a book that had that story and many other stories of Oklahoma buried treasure. I also found and indian craved in to the side of a rock wall near Turkey Mountain outside of Jenkins by the railroad tracks. That picture is also shown in the book. They think the jaw points to something or somewhere but not sure. As far as I know this is still not understood as of today.