1. Laboratory of Palaeobotany and Palynology, Department of Botany, Faculty of Science, University of Lagos, Nigeria
2. Department of Archaeology and Anthropology, University of Ibadan, Nigeria
3. KrA Stratigraphic Ltd, Deganwy, Conwy, LL31 9YY United Kingdom
4. Institute for Biodiversity and Ecosystem Dynamics (IBED), University of Amsterdam, The Netherlands