Geophysicist proves the Sphinx is 4,500 years old

As a geophysicist I have solved what some consider to be one of the greatest archaeological mysteries of all time: what caused the erosion and, as a consequence, determined the true age of the Great Sphinx of Giza. Although perhaps the most iconic statue in the world, the Sphinx remains one of the most enigmatic. Despite extensive scientific research, who built it and when remains a mystery. Archaeologists conclude that the Sphinx was constructed during the Fourth Dynasty, approximately 4,500 years ago, as part of the Giza Necropolis. This age determination is based on the association of the Sphinx with the Khafra pyramid complex. Nevertheless, its true age remains elusive, as there are no known ancient inscriptions dating to its construction. According to Zahi Hawass, “The Sphinx is among those few monuments the original date of which is still debated by scholars; nowadays, amongst archaeologists, the question of who commissioned the Sphinx is between Khafra and Khufu, only a generation apart.”

Water Erosion Hypothesis

In 1991, Robert Schoch, a geophysicist, and John Anthony West, an independent Egyptologist, presented a paper at the annual Geological Society of America meeting, claiming that the Sphinx bears the unmistakable evidence of erosion by precipitation. In doing so, they pushed the construction of the Sphinx back by thousands of years. They assert that water erosion itself serves as evidence of a lost predynastic civilization responsible for constructing the Sphinx. This challenges the current understanding of ancient human history and the development of civilization. Evidence of a lost civilization sent shock waves through the archaeological community triggering a media frenzy. To this day, their paper remains the cornerstone of alternative archaeology. Colin Reader, another geologist, lends support to the water erosion hypothesis.

Sphinx Erosion

The presence of erosion was nothing new. In fact, erosion is one of the few things about the Sphinx that everyone agrees on. Archaeologists and geologists believe the Sphinx has been subjected to erosion for millennia, resulting in the loss of around 1.5 meters from its surface. What remains today is considered to be a ragged, eroded core of a once pristine sculpture. Numerous theories have been proposed to account for the erosion, ranging from windblown sand, Nile floods, upward wicking of salty groundwater, precipitation, and the formation and evaporation of nightly dew. Yet despite decades of research, no geologic process has been identified that could account for the degree and pattern of erosion seen on the Sphinx over the past 4,500 years.

PROPOSED SPHINX EROSIONAL

PROCESSES

PRECIPITATION: About 2.7 cm annually for the last 5,000 years, significantly higher prior to 3,500 BCE. AEOLIAN: Sandblasting by windblown particles. DEW: Nightly dew dissolves salt, that recrystallizes in rock pores in the morning. Pressure builds as crystals form causing the limestone to exfoliate. GROUNDWATER: Wicking groundwater forms salt crystals as it evaporates. Pressure builds as the crystals form causing the limestone to exfoliate. NILE FLOODING: Annual Nile floods erode the Sphinx limestone. WET SAND: Sand surrounding the Sphinx was wetted by precipitation and floods. Moisture weathered the rock making i6t susceptible to erosion.

No single, nor combination, of erosional processes can account

for the degree and pattern of erosion seen on the Sphinx.

A New View

After more than a decade of research, I conclude that every archaeologist and geologist who has ever studied the Sphinx is wrong. At the 2025 annual Geological Society of America meeting, I presented a paper claiming that there is very little erosion of any type on the Sphinx, That what others have described as erosion was actually part of the construction process. The Sphinx, like other Old Kingdom structures, was carved using two-handed stone pounders, stone hammers, and copper chisels. While the head and lower body were carved in-situ, I propose that the softer, weathered limestone layers of the Sphinx body were pounded back, then covered with a veneer of high-quality limestone blocks. The block veneer was then sculpted to form the surface of the Sphinx body. Buried in windblown sand for most of the past 4,500 years (only the head and upper sections of the body were exposed), the sand provided protection from the elements. Over millennia, exposed veneer blocks were looted, revealing the rough-carved body beneath that has been misidentified as erosion.

The Osiris Shaft

Evidence for the lack of erosion on the Sphinx comes from the Osiris Shaft. Located on the causeway halfway between the Sphinx and the Khafra pyramid, the shaft descends through the same limestone as exposed on the Sphinx body. As with the Sphinx, the ancient Egyptians pounded the softer limestone layers back, making the walls of the Osiris Shaft appear as eroded, if not more so, than the Sphinx body. Chisel marks on the harder protruding layers indicate that there has been very little, if any, erosion in the Osiris Shaft.

Historical Significance

My research fundamentally transforms our understanding of the construction and subsequent history of the Sphinx while simultaneously confirming that archaeologists were right regarding its age. The absence of significant erosion indicates the Sphinx could only have been constructed within the past 5,000 years. Given the limited erosion, there is nothing to support the hypothesis that the Sphinx predates the other structures at Giza.

Conclusions

• Most “erosion” was part of the construction process. • The weathered limestone of the Sphinx body was too soft to carve, forcing the builders to pound the limestone back then cover the body with high-quality limestone blocks from the start. • Erosion prevented Mark Lehner from assigning the high-quality limestone blocks to the original construction. • Sphinx construction and timeline of repairs needs to be reworked.

Implications for Alternative

Archaeology

Solving the mystery of the erosion and age of the Sphinx goes beyond its archaeological significance, as erosion forms the foundation upon which alternative archaeology is built. In 1979, West wrote: “If the single fact of the water erosion of the Sphinx could be confirmed, it would in itself overthrow all accepted chronologies of the history of civilisation; it would force a drastic reevaluation of the assumption of ‘progress’ — the assumption upon which the whole of modern education is based. It would be difficult to find a single, simple question with graver implications.” If West's assertion is true, then disproving the water erosion hypothesis would have similar ramifications on the fundamental assumptions of alternative archaeology. It would be difficult to find a single, simple fact with graver implications for alternative archaeology.