Nor are Schoch's findings incontrovertible proof of a much, much earlier dating to the structures on the Giza plateau; it is just another 'theory'. Dr. Schoch's claims are contested by specialists in his own field while others still dispute his findings entirely.
Colin Reader, a British geologist motivated by Schoch's study, undertook a study of his own and determined that the erosion on the western enclosure wall - referred to by Schoch as justification for a much earlier dating - was not caused by rainfall itself but by rainfall run off as any evidence of such extreme erosion could not be found on the other enclosure walls.
Reader's claim is based on the topography of the plateau: it is eastward sloping, hence rainwater run off has caused the erosion we see today on the western enclosure wall.
Even if Reader is correct, Egyptologists have to concede that the established dating of the Sphinx is out by around 400 years. The response is an unsurprising "possible" but "unproven", though I am sure 400 years is a little more comforting than Schoch's much, much earlier dating.
For a fuller discussion, with illustrative images, see here:
At the bottom of the page, questions raised by fellow geologists to Reader's findings, with his reply.
Edited 1 time(s). Last edit at 23-Dec-16 07:49 by eyeofhorus33.