The view of Professor Robert Schoch Schoch is a renowned figure, indeed notorious, for the case he's made, based on strict geological evidence, that the Great Sphinx of Giza bears the unmistakable erosion patterns of thousands of years of heavy rainfall.6 This means it has to be much older than 2500 BC (the orthodox date, when Egypt received no more rain than it does today) and must originally have been carved around the end of the Ice Age when the Nile valley was subjected to a long period of intense precipitation.