> A huge block of sandstone 8 metres square and
> near a metre deep (circa 150 tons) how
> do you even think of undercutting it or splitting
> it, let alone dragging in one piece, down a
> mountain slope?
> Nah not possible imho. But likely took lots of
> smaller size ones from the quarry sites.
Hundreds of stone much larger than 150 tons were moved by various civilization up and over hills, up and down ramps and across obstacles. Personal incredulity never overrules reality. Yet moving heavy stone was very difficult which is why the number of ones over 500 tons is very small - it was just to difficult to do on a regular basis.
However I remember one Inca story told to the Spanish was that 3,000 men were killed when a stone got away from its movers. Interesting legend.