1Laboratory of Geology of the Engineer and Alterology, Department of Earth Sciences, Faculty of Sciences, University of Yaounde I, Cameroon.
2 Hydrological Research Center (HRC), Institute of Geological and Mining Research (IRGM), P. O. Box 4110 Nlongkak-Yaounde, Cameroon.
3Laboratory of Geology, Department of Biological Sciences, Higher Teacher training school, University of Yaounde , P. O. Box 47, Yaounde I, Cameroon
Email: [email protected]; [email protected]