1. Volcanology and Environmental Geosciences Research Unit, Department of Geology, Faculty of Science, University of Buea, Buea P.O. Box 63, Cameroon
2. Ministry of Scientific Research and Innovation, Regional Delegation of the South-West Region, Buea P.O. Box 461, Cameroon
3. Petroleum Geology and Sedimentology Research Unit, Department of Geology, Faculty of Science, University of Buea, Buea P.O. Box 63, Cameroon