This suggestion has been out there for a number of years, but with limited evidence. Other bits to this include a massive farming belt that existed around Botswana and Namibia, with a massive irrigation system (canal system) which was fed by healthy rainfall throughout the year (all more than 10,000 years ago).
Would you happen to know some related coordinates?
This also lends credence to the theory that the Sphinx is much older than the academic establishment wants you to believe, on the basis of clear evidence of erosion to the sandstone from rainfall.