Very good Tom. You got it. Notice the concrete fill in the cavity? A little monument to our previous Supervisor, I find relics of tree care past all of the time.
There was a large oak removed on the V.A. campus across the street from us two weeks ago (we counted 125+ rings) that had completely enveloped a slab of concrete appr. 12"wide X 3"thick X 4' tall with a peice of rebar in it. Nobody called me till it was over, but I hear they had to use an enormous bottle jack to break it loose from the stump. I will try to grab some pics of the stump next chance I get. It had to suck finding that with the saw.