Robert Schoch
Geologist — PhD Geology, Yale University. Faculty, Boston University.
Robert Schoch is a geologist with a PhD from Yale University and a faculty position at Boston University whose re-dating of the Great Sphinx has made him one of the most prominent figures in the debate over pre-dynastic civilizations.
Biography
Robert Schoch is a geologist with a PhD from Yale University and a faculty position at Boston University whose re-dating of the Great Sphinx has made him one of the most prominent figures in the debate over pre-dynastic civilizations. In 1990, Schoch conducted a geological and seismic survey of the Sphinx enclosure at Giza and concluded that the erosion patterns on the walls were caused by water — specifically, prolonged rainfall — rather than wind and sand. Since Egypt's climate shifted from wet to arid around 5000 BCE (and was significantly wetter before 9000 BCE), Schoch argued that the Sphinx enclosure must have been carved no later than 9700 BCE and possibly earlier. His seismic surveys found deeper subsurface weathering than would be expected if the enclosure were carved during Khafre's reign (circa 2500 BCE). The mainstream counter-argument, advanced most prominently by Egyptologist Mark Lehner, holds that the archaeological sequencing at Giza does not permit a pre-Khafre date for the Sphinx, and that the erosion patterns can be explained by other mechanisms including salt weathering and poor-quality limestone. Schoch's relevance to Indian chronology research is as a global comparator. If the Sphinx genuinely dates to 9700 BCE or earlier, it provides an independent data point for the existence of sophisticated construction capabilities in the pre-Younger Dryas world — the same period in which Oak places the Ramayana (12,209 BCE). Schoch does not work on Indian sites, but his geological approach and willingness to challenge established chronologies parallel the methodological stance of the Indian archaeoastronomers. His later work on solar outbursts and their role in civilizational disruption also connects to the Younger Dryas catastrophism framework.
Methodology
Geological and seismic analysis of ancient monuments. Water erosion patterns, seismic surveys, comparative weathering analysis.
Key Claims
- 1Great Sphinx enclosure shows water erosion, not wind erosion
- 2Sphinx dates to minimum 9700 BCE based on erosion patterns
- 3Seismic surveys confirm deeper weathering than Khafre-era construction allows
Major Works
- •Voices of the Rocks: A Scientist Looks at Catastrophes and Ancient Civilizations (1999)
- •Forgotten Civilization: The Role of Solar Outbursts in Our Past and Future (2012)