Pyramid Stones Were Poured, Not Quarried

French and American researchers have discovered that the stones on the higher levels of the great pyramids of Egypt were built with concrete. Until recently it was hard for geologists to distinguish between natural limestone and the kind that would have been made by reconstituting liquefied lime. They found traces of a rapid chemical reaction which did not allow natural crystallisation. The reaction would be inexplicable if the stones were quarried, but perfectly comprehensible if one accepts that they were cast like concrete