The Age of Omo I and Omo II from the Kibish Formation, Omo Valley, Ethiopia

Anthropology.net

Two articles in the Journal of Human Evolution reanalyze the geochronology of the Kibish Formation, in the Omo Valley, Ethiopia. One is titled, “Microstratigraphy of the Kibish hominin sites KHS and PHS, Lower Omo Valley, Ethiopia,” and the other is titled, “Sapropels and the age of hominins Omo I and II, Kibish, Ethiopia.”

Excavations of Kibish Formation between 1967–1974, yielded two very important Homo sapiens calvariae, each from different localities — Omo I which resembles modern humans and Omo II which has more primitive features. Omo I’s site was called Kamoya’s Hominid Site (KHS) after the discoverer, and about 2.6 km northwest of KHS, Omo II’s site, Paul’s Hominid Site (PHS) is located. These two were first indirectly dated to be 130,000 years old by a U-series disequilibrium analysis (a measurement of the decay of uranium into thorium over time) from layer near the Omo I site…

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