His studies of the Sphinx have contributed to the controversial debate regarding a possible older dating of the monument. He suggested on the basis of weathering evidence that the Sphinx is older than its commonly accepted 4th dynastic date and instead it and two other buildings on the Giza Plaeau date to the early dynastic or late predynastic period.
Publications include A geomorphological study of the Giza necropolis with implications for the development of the site (Archaeometry 43: 1 (2001) pp149–165)
- Giza Before the Fourth Dynasty by Colin Reader reproduced from the Journal of the Ancient Chronology Forum (JACF) 9 (2002), pp. 5–21
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