I was about to takethe chain saw to this to make it manageble but just got back from Sedona - they make some pretty nice tables, sculptures, etc out of similar items and sell them for a lot!
If you can bring enough people and a trailer or so, you can have it. Lots of intertwined burls on the bottom. IT IS HEAVY
I think it is Austalian Willow known as: Scientific Name: Geijera parviflora Trade Name: Wilga Family Name: Rutaceae Density: 895 kg/m³
We have 3 pallets of broken concrete free for the taking. It is irregular shape, not flat sidewalk pieces, but the pieces are a good size (not a bunch of small rubble).