Abstract
The Plio-Pleistocene Konso Formation is widely exposed in the Konso area located at the southwestern end of the southern sector of the Main Ethiopian Rift. It is known for its rich Acheulean archeological occurrences and abundant vertebrate fossils, including those of A. boisei and H. erectus. The formation also contains more than 30 tephra layers. The lithologic characterization and major element compositions of discrete glass shards of these tephra, combined with single-crystal 40 Ar/ 39 Ar dating of seven tuffs, have established the tephrostratigraphy and age range of the 200-m thick formation. The succession at Konso was deposited between approximately 1.9 and 1.4 Ma and is divided into the Sorobo, Turoha, Kayle, and Karat Members in ascending stratigraphic order. Two of the Konso tephra are correlative to the Pliocene KBS and the early Pleistocene Chari Tuffs of the Omo-Turkana Basin along the Ethiopian and Kenyan border. This correlation enables precise time-controlled comparisons of faunal and archeological remains between the two regions.
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