Ah, no. Or yes, actually; it just isn't possible in TG, unless folding some parts of the globe across eachother. That may have happened here, or it's a trick of the eye.
Some new experiment, trying to get squarish rocks without compute terrain. Just a mix of subtle vector displaced smooth voro-noise, mixed with fake stones (I wish those smooth voronoi versions would have adjustable smoothness). Renders in 19mins.
Never mind the title; I started out trying to get hanging valleys, without succes, so far.