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Approximate age:300,000 years old=average of minimum (0.1 Ma) and maximum (0.5 Ma)

Date based on: Guesswork, but certainly above lower Chari Member, which tops out at 730k. "The stratigraphic revision at Koobi Fora covers only the Omo Group deposits there, but some later deposits do occur in the region. Two hominids, KNM-ER 999 and KNMER 3884, were formerly attributed to the Guomde Formation, most of which has been subsumed into the Chari Member of the Koobi Fora Formation (Brown and Feibel, 1986). These two fossils, however, derive from undifferentiated later deposits, probably in the time span 0.5 to 0.1 my."
-Feibel et al. (2005) See map of sites with similar ages

Dating reference: Feibel, C. S., Brown, F. H., & McDougall, I. (1989). Stratigraphic context of fossil hominids from the Omo Group deposits: Northern Turkana Basin, Kenya and Ethiopia. American Journal of Physical Anthropology, 78(4), 595-622.; Brown, F. H., & Feibel, C. S. (1986). Revision of lithostratigraphic nomenclature in the Koobi Fora region, Kenya. Journal of Geological Society, 143(2), 297.

Hominids: Homo rhodesiensis       

Archaeology:      

Important specimens: ER 3884, ER 999

Notes: The 'Guomde cranium' is one in the same as ER 3884.

Location: Koobi Fora Formation (formerly part of the Guomde Formation), East Lake Turkana, Kenya
Map location/coordinates reference: Pobiner, B. L. (2007). Hominin-carnivore interactions: evidence from modern carnivore bone modification and Early Pleistocene archaeofaunas (Koobi Fora, Kenya; Olduvai Gorge, Tanzania). RUTGERS THE STATE UNIVERSITY OF NEW JERSEY-NEW BRUNSWICK.

Key references: