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Approximate age:1,150,000 years old=average of minimum (1.1 Ma) and maximum (1.2 Ma)
Date based on: Ar-Ar See map of sites with similar ages
Dating reference: 40Ar/39Ar incremental-heating experiments on basaltic lavas and single-crystal total-fusion analyses of trachytic tuffs provide for the first time accurate resolution of the chronostratigraphy of the Pleistocene Peninj Group west of Lake Natron, northern Tanzania. These new data force a major revision of the chronology of the entire sequence: the base of the group is now ~1.75 Ma, the Wa Mbugu basalt within the Main Tuff is 1.19 ± 0.03 Ma (Cobb Mountain paleomagnetic event), and the top of the Peninj Group is 1.01 ± 0.03 Ma. Thus the Achulean and Olduwan artifact assemblages found in the Upper Sands and Clays of the upper Humbu Formation above the Wa Mbugu basalt are about ~1.2 to 1.1 Ma, half a million years younger than previously believed. The revised chronology also clarifies the age of the major lake expansion recorded within the upper part of the Peninj Group. This lacustrine phase is now constrained to ~1.1 to 1.0 Ma, corresponding to a previously identified episode of lake expansion in East Africa between 1.1 and 0.9 Ma (Trauth et al., 2005).
Hominids: Australopithecus boisei
Archaeology:Oldowan Acheulean
Important specimens: Peninj Mandible, various Olduwan and Acheulean sites
Notes: 40Ar/39Ar Dating of the Pleistocene Peninj Group, Lake Natron, Tanzania
Deino, A. L.; Dominguez-Rodrigo, M.; Luque, L. Keywords: paranthropus Paranthropus
American Geophysical Union, Fall Meeting 2006, abstract #V53C-1771; Original dating by Glynn Ll. Isaacs & Garniss H. Curtis Nature 249, 624 - 627 (1974) | doi:10.1038/249624a0.
Location: Humbu Formation, West Lake Natron, Tanazia
Map location/coordinates reference: Ignacio de la Torre, Rafael Mora, Jorge Martínez-Moreno, The early Acheulean in Peninj (Lake Natron, Tanzania), Journal of Anthropological Archaeology 27 (2008) 244?264. Coordinates are general, and are accuarate at the level of the Peninj Group as no plot of the mandible site was available in this paper.
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Peninj
