1. McDonald Institute for Archaeological Research, University of Cambridge , Cambridge CB2 1TN
2. Research Centre in Evolutionary Anthropology and Paleoecology, Liverpool John Moores University , Liverpool, Merseyside L3 5UX
3. Department of Earth Sciences, University of Cambridge , Cambridge CB2 1TN
4. Structure and Motion Laboratory , Royal Veterinary College, London NW1 0TU
5. Department of Archaeology, University of Cambridge , Cambridge CB2 1TN
6. Department of Archaeology, Ghent University , 9000 Ghent