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Approximate age:547,500 years old=average of minimum (0.491 Ma) and maximum (0.604 Ma)
Date based on: Ar-Ar See map of sites with similar ages
Dating reference: Behrensmeyer AK (2002) Olorgesailie, Kenya: a million years in the life of a rift basin.
; 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:
Important specimens:
Notes: These are the dates that bracket the Member. There is a pers. comm. to Deino regarding the date of pumices obtained from Member 12 reported in Potts et al. 1988. He reprts Deino give a provisional age of 0.56 ± 0.06 Ma (Potts R, Shipman P, Ingall E (1988) Taphonomy, paleoecology, and hominids of Lainyamok, Kenya. Journal of Human Evolution 17(6): 597-614.)
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 Unpublished Report, Mines and Geological Department, Nairobi.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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Olorgesaille Member 12
