How old is the Sphinx?

[Minimalist]

But sometime before 3,500 BC the pre-dynastic Egyptians began building with mud bricks. Unless they were complete morons - which I reject - they would not have used mud bricks in a wet climate.

http://goldhistorian.blogspot.com/2012/0...ation.html

The Amratian culture lasted from about 4000 to 3500 BC. It is named after the site of El-Amra.During this period Black-topped ware continues to appear, but white cross-line ware, a type of pottery which has been decorated with close parallel white lines being crossed by another set of close parallel white lines, is also found at this time.New innovations appeared in Amratian settlements as precursors to later cultural periods the mud-brick buildings for which the Gerzean period is known were first seen in Amratian times, but only in small numbers.

BTW, desert winds blowing sand are a very effective agent of erosion.