Dunno about the tree species, but that root ball could have some fun stuff in it. It'd take a serious pressure washing and still probably eat a chainsaw blade or two, but I'll bet there's something cool inside. From the looks of the pic, it'd take a lot of chain saw work, but you'd likely get several lathe-sized pieces.
For flatwork, there's probably also some cool stuff in there, too, just need a couple of big saws (chain and band) to get it cut up.