1. Laboratory of Paleobotany and Palynology, Department of Botany, University of Lagos, Lagos, Nigeria
2. Climate Team, Centre Européen De Recherche et D’enseignement Des Géosciences De L’environnement (CEREGE), Aix-en-Provence, France
3. Kunming Institute of Botany, Chinese Academy of Science, Kunming, Yunnan Province, China