(3) Present on the body of the Sphinx, as well as on other Giza Plateau structures (and essentially forming an overlay on many precipitation-induced and wind-induced megascopic weathering features), are weathering features that are interpreted as resulting from relatively recent (within the last couple of centuries) efflorescing of dissolved and recrystallized minerals (such as halite) on the rock surfaces, which have subsequently flaked off and deteriorated the stone. (4) Weathering due to the dissolution and recrystallization of calcite and other minerals in the rocks is visible within various tombs and other chambers cut into the bedrock of the Giza Plateau.This may occur on a daily basis, as water condenses on the cool surfaces of these man-made caves, and subsequently evaporates once again as the temperature rises.
Based on my field observations of the granite ashiars and the underlying limestone core blocks, I believe that the core blocks in both temples were exposed to the elements and underwent considerable weathering and erosion before the granite facings were installed.
In places the backs of the granite blocks were cut in irregular, undulating patterns so that they complemented or matched the irregular weathering patterns on the limestone blocks which they were used to refurbish.
] standing sixty-six feet (twenty meters) high and 240 feet (seventy-three meters) long, sits on the edge of the Giza Plateau (just west of Cairo, Egypt), east of the three great pyramids.
Most Egyptologists currently attribute the carving of the Great Sphinx to King Chafre (Chephren) of the Old Kingdom's Fourth Dynasty, in approximately 2500 B. by various chronologies.[It is important to read the LAST PARAGRAPH of this paper and to understand the mindset of a geologist who was raised by his grandmother, she was a Rosicrucian - Robert Schoch looked specifically for any geological features that would 'prove' his theory, he was not neutral in his search of geological data when he told me his story of his interest in Egypt and Edgar Cayce and the Sphinx prior to joining JAW.
In this mode of weathering, the original profiles of the carved faces of tombs and other structures are still clearly visible (sometimes containing easily legible hieroglyphic inscriptions); but the softer, less competent layers of rock have been "picked out" by wind and sand abrasion, with the consequent formation of deeply eroded "wind-tunnel" features.