Thanks for the reminder and link to your post. I wonder who Mark got his info from? Do you believe the tree you looked at is the same tree that he mentioned in the post at his blog?
There is only one tree that is *right there* and it is pretty large.
There is only one tree in that location. The bark is pretty rough, and it does have insect holes in it, but no shrapnel marks. Particularly any that look like it was hit with nails, as he apparently said.