About the Authors

Kenneth Wardle


Affiliation Department of Classics, Ancient History and Archaeology, University of Birmingham, Birmingham, United Kingdom

Thomas Higham

Affiliation Oxford Radiocarbon Accelerator Unit, Research Laboratory for Archaeology and the History of Art, University of Oxford, Oxford, United Kingdom

Bernd Kromer

Affiliation Akademie der Wissenschaften Heidelberg, Heidelberg, Germany

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: KW TH BK. Performed the experiments: KW TH BK. Analyzed the data: KW TH BK. Contributed reagents/materials/analysis tools: KW TH BK. Contributed to the writing of the manuscript: KW TH BK.