About the Authors

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

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

Bernd Kromer
Akademie der Wissenschaften Heidelberg, Heidelberg, Germany

Corresponding Author

k.a.wardle@bham.ac.uk

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.