1. Department of Physics, Earth Science, and Space Systems Engineering, Morehead State University, Morehead, Kentucky, USA
2. Department of Geography and Planning, School of Environmental Sciences, University of Liverpool, Liverpool, UK
3. Shell International Exploration and Production, London SE1 7NA, UK
4. Department of Geography and Environmental Sciences, Northumbria University, Newcastle upon Tyne, UK
5. Department of Palynology and Climate Dynamics, Georg-August-University Göttingen, Germany