1. School of Geography, Geology and the Environment, University of Leicester, Leicester LE1 7RH, UK
2. School of Archaeology and Ancient History, University of Leicester, Leicester LE1 7RH, UK
3. Department of Classics and Archaeology, University Park, University of Nottingham, Nottingham NG7 2RD, UK
4. School of Animal, Rural and Environmental Sciences, Nottingham Trent University, Nottingham NG25 0QF, UK
5. School of Agriculture Science, North West University, P Bag X 2046, Mmabatho 2735, South Africa