> I was referring the point --- were the stones shaped by
> "routers" ---
Sure, why not. It's not like there are no other signs of advanced tooling. This past October ('14) we discussed what looked like a huge modified basalt "cross slide" that you'd find on a modern lathe found in the midst of granite and limestone rubble:
MODERN LATHE CROSS SLIDE:
ANCIENT BASALT SLAB:
How can any of us ever know, when all we can do is think?