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African Archaeological Review

, Volume 33, Issue 3, pp 251–263 | Cite as

An Early Pleistocene Phytolith Record from Wonderwerk Cave, Northern Cape, South Africa

  • Lloyd RossouwEmail author
Original Article

Abstract

Grass silica short cell phytoliths were sampled from the four lowermost archaeological strata in excavation 1 at Wonderwerk Cave and offer an independent record of climatic change during an episode of Early Stone Age hominin occupation at the cave. Linked to differences in growing season temperature and the geographic distribution of C3 and C4 grasses in southern Africa, fossil grass phytoliths were used to trace palaeoenvironmental shifts at the site. The results suggest that Early Pleistocene environmental conditions at the cave fluctuated: between wetter and drier summer–rainfall growing conditions (C4) towards the end of the Olduvai subchron and the beginning of the subsequent interval of reversed polarity, to mostly dry and cooler winter–rainfall growing conditions (C3), that continued throughout the interval. It ended with a shift towards increased summer rainfall aridity at around one million years ago. The fluctuation between markedly wetter and drier C4 conditions at the cave (NADP-me grass types vs. NAD-me grass types) does not support the premise that the expansion of C4 grasslands was always coupled with increased aridity.

Keywords

Early Pleistocene Early Stone Age Phytoliths Palaeoclimate Southern Africa 

Résumé

Les phytolithes récoltés dans les quatre plus anciens niveaux du site archéologique de la grotte de Wonderwerk (Excavation 1), offrent des données indépendantes concernant le changement climatique de l’occupation humaine du Paléolithique inférieur de la grotte. Soumis aux différences de température saisonnière et à la répartition géographique des graminées en C3 et C4 d’Afrique australe, les phytolithes des plantes fossiles ont servi à reconstituer les changements paléo-environnementaux du site. Nos résultats démontrent qu’au Pléistocène ancien, l’environnement de la grotte se modifie: les conditions de croissance (en C4) liée aux précipitations estivales, fluctuent entre humidité et sécheresse à la fin de l’Oldoway subchron et au début de l’intervalle de polarité inversée qui suit. Elles deviennent sèches et plus froides avec les précipitations hivernales (en C3) tout au long de l’intervalle, et aboutissent à une augmentation de l’aridité liée aux précipitations estivales il y a environ un million d’années. A Wonderwerk, les variations entre des conditions en C4 nettement plus humides et plus sèches (type de prairie NADP-me versus NAD-me) contredisent la thèse d’une expansion des prairies en C4 exclusivement associée à un accroissement de l’aridité.

Notes

Acknowledgments

I am grateful to Michael Chazan and Liora Horwitz for providing access to WWC and for their encouragement and assistance. A sampling and analysis permit issued by the South African Heritage Resources Agency provided access to the soil samples analyzed for this study. I would also like to acknowledge the invaluable contribution of Louis Scott to this project through his continuing support and counsel. I thank the reviewers for critically reviewing the paper and for providing helpful comments.

Compliance with Ethical Standards

Funding

The study was funded through the research budget of the Archaeology Department at National Museum Bloemfontein, South Africa.

Conflict of Interest

The author declares that he has no conflict of interest.

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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  1. 1.Department of ArchaeologyNational MuseumBloemfonteinSouth Africa
  2. 2.Department of Plant SciencesUniversity of The Free StateBloemfonteinSouth Africa
  3. 3.The Department of BiologyUniversity of WashingtonSeattleUSA

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