Olduvai's oldest Oldowan

Stollhofen H, Stanistreet IG, Toth N, Schick KD, Rodriguez-Cintas A, Albert RM, Farrugia P, Njau JK, Pante MC, Herrmann EW, Ruck L, Bamford MK, Blumenschine RJ, Masao FT (2021)

Publication Type: Journal article, Original article

Publication year: 2021


Book Volume: 150

DOI: 10.1016/j.jhevol.2020.102910


Previously, Olduvai Bed I excavations revealed Oldowan assemblages <1.85 Ma, mainly in the eastern gorge. New western gorge excavations locate a much older similar to 2.0 Ma assemblage between the Coarse Feldspar Crystal Tuff (similar to 2.015 Ma) and Tuff IA (similar to 1.98 Ma) of Lower Bed I, predating the oldest eastern gorge DK assemblage below Tuff IB by similar to 150 kyr. We characterize this newly discovered fossil and artifact assemblage, adding information on landscape and hominin resource use during the similar to 2.3-2.0 Ma period, scarce in Oldowan sites. Assemblage lithics and bones, lithofacies boundaries, and phytolith samples were surveyed and mapped. Sedimentological facies analysis, tephrostratigraphic and sequence stratigraphic principles were applied to reconstruct paleoenvironments and sedimentary processes of sandy claystone (lake), sandstone (fluvial), and sandy diamictite (debris flow) as principal lithofacies. Artifacts, sized, weighed, categorized, were examined for petrography, retouch, and flake scar size. Taxonomic classifications and taphonomic descriptions of faunal remains were made, and phytoliths were categorized based on reference collections. Lithics are dominantly quartzite, mainly debitage and less frequently simple cores, retouched pieces, and percussors. Well-rounded spheroids and retouched flakes are rare. Identifiable taxa, Ceratotherium cf. simum (white rhinoceros) and Equus cf. oldowayensis (extinct zebra), accord with nearby open savanna grasslands, inferred from C-3 grass, mixed and/or alternating with C-4 grass-dominated phytolith assemblages. Palms, sedges, and dicots were also identified from phytoliths. Diatoms and sponge spicules imply nearby freshwater. The assemblage accumulated at the toe of a Ngorongoro Volcano-sourced fan-delta apron of stacked debris flows, fluvials, and tuffs, preserving fossil tree stumps and wooded grassland phytoliths farther upfan. It formed after the climax of Ngorongoro volcanic activity during a Paleolake Olduvai lowstand and was then buried and preserved by lacustrine clays, marking the first of two lake transgressions, signifying wetter climates. Orbital precessional lake cycles were superposed upon multimillennial (similar to 4.9 kyr) lake fluctuations. (C) 2020 Elsevier Ltd. All rights reserved.

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Stollhofen, H., Stanistreet, I.G., Toth, N., Schick, K.D., Rodriguez-Cintas, A., Albert, R.M.,... Masao, F.T. (2021). Olduvai's oldest Oldowan. Journal of Human Evolution, 150. https://doi.org/10.1016/j.jhevol.2020.102910


Stollhofen, Harald, et al. "Olduvai's oldest Oldowan." Journal of Human Evolution 150 (2021).

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