Originally Posted by jlmran
Holy cow thats a deep one. You must have a deep top soil. The roots here spread out more.
That's a Black Walnut tree looking for water in a desert climate. To find top soil , if it could be called that , I would need to go between sand hills into a bottom for a couple of inches of top soil at most.
I've found with grinding as the grinds and roots decay over a long period of time soil must be added occasionally as a low area develops there. I suppose with grinding or excavating it's 6 of one and half dozen of the other.