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Approximate age:493,000 years old=average of minimum (0.491 Ma) and maximum (0.495 Ma)
Date based on: Ar-Ar See map of sites with similar ages
Dating reference: Deino, A., & Potts, R. Single-crystal 40Ar/39Ar dating of the Olorgesailie Formation, southern Kenya rift. Journal of Geophysical Research-Solid Earth, 95(B6).
Hominids:
Archaeology:Acheulean
Important specimens:
Notes: This is a rough date for the whole memeber based on a single unit, not a well bracketed date
Location: Southern Kenya Rift, Kenya
Map location/coordinates reference: Shackleton, R. M. (1944). Preliminary Report on the Olorgesailie Prehistoric site. Unpublished Report, Mines and Geological Department, Nairobi.
Leakey, L. S. B. (1946). A prehistorian's paradise in Africa: early Stone Age sites at Olorgesailie.' Illustrated London News, 5, 1-113.
Key references: Isaac GL, Isaac B (1977) Olorgesailie: archeological studies of a middle Pleistocene lake basin in Kenya: University of Chicago Press Chicago.
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