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Geochemical “fingerprints” for Olduvai Gorge Bed II tuffs and implications for the Oldowan–Acheulean transition

Published online by Cambridge University Press:  20 January 2017

Lindsay J. McHenry ,
Jackson K. Njau ,
Ignacio de la Torre  and
Michael C. Pante
Lindsay J. McHenry*
Affiliation:
Department of Geosciences, University of Wisconsin-Milwaukee, 3209 N. Maryland Ave., Milwaukee, WI 53211, USA
Jackson K. Njau
Affiliation:
Department of Geological Sciences, Indiana University, 1001 E 10th Street, Bloomington, IN 47405, USA The Stone Age Institute, 1392 W. Dittemore Rd., Gosport, IN 47433, USA
Ignacio de la Torre
Affiliation:
Institute of Archaeology, University College London, 31-34, Gordon Square, WC1H 0PY London, United Kingdom
Michael C. Pante
Affiliation:
Department of Anthropology, Colorado State University, 1787 Campus Delivery, Fort Collins, CO 80523, USA
*
⁎Corresponding author. E-mail address:lmchenry@umwm.edu (Lj. McHenry).
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Abstract

Bed II is a critical part of early Pleistocene Olduvai Gorge, Tanzania. Its deposits include transitions from humid to more arid conditions (with associated faunal changes), from Homo habilis to erectus, and from Oldowan to Acheulean technology. Bed II (~ 1.8–1.2 Ma) is stratigraphically and environmentally complex, with facies changes, faulting, and unconformities, making site-to-site correlation over the ~ 20 km of exposure difficult. Bed II tuffs are thinner, less evenly preserved, and more reworked than those of Bed I. Five marker tuffs (Tuffs IIA–IID, Bird Print Tuff (BPT)), plus local tephra, were collected from multiple sites and characterized using stratigraphic position, mineral assemblage, and electron probe microanalysis of phenocryst (feldspar, hornblende, augite, titanomagnetite) and glass (where available) composition. Lowermost Bed II tuffs are dominantly nephelinitic, Middle Bed II tuffs (BPT, Tuff IIC) have basaltic components, and upper Bed II Tuff IID is trachytic. The BPT and Tuff IID are identified widely using phenocryst compositions (high-Ca plagioclase and high-Ti hornblende, respectively), though IID was originally (Hay, 1976) misidentified as Tuff IIC at Loc 91 (SHK Annexe) in the Side Gorge. This work helps establish a high-resolution basin-wide paleolandscape context for the Oldowan–Acheulean transition and helps link hominin, faunal and archaeological records.

Keywords

Olduvai GorgeTephrostratigraphyTephrochronologyPleistoceneAcheuleanOldowan
Type
Original Articles
Information
Quaternary Research , Volume 85 , Issue 1 , January 2016 , pp. 147 - 158
Copyright
University of Washington

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