About the Authors

Thembi Russell

thembiwe.russell@wits.ac.za

Affiliation School of Geography, Archaeology and Environmental Studies, University of the Witwatersrand, Johannesburg, South Africa

Fabio Silva

Affiliations Institute of Archaeology, University College London, London, United Kingdom, School of Archaeology, History and Anthropology, University of Wales Trinity Saint David, Lampeter, United Kingdom

James Steele

Affiliations School of Geography, Archaeology and Environmental Studies, University of the Witwatersrand, Johannesburg, South Africa, Institute of Archaeology, University College London, London, United Kingdom

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: TR FS JS. Performed the experiments: TR FS JS. Analyzed the data: TR FS JS. Wrote the paper: TR FS JS.