About the Authors
- David Burley
- Department of Archaeology, Simon Fraser University, Burnaby, British Columbia, Canada
- Marshall I. Weisler
- School of Social Science, University of Queensland, St Lucia, Queensland, Australia
- Jian-xin Zhao
- Centre for Microscopy and Microanalysis, University of Queensland, St Lucia, Queensland, Australia
The authors have declared that no competing interests exist.
Conceived and designed the experiments: DB MIW JxZ. Performed the experiments: JxZ. Analyzed the data: DB MIW JxZ. Contributed reagents/materials/analysis tools: DB JxZ. Wrote the paper: DB MIW JxZ.