Palynological studies on other lacustrine sites situated in the forest block of South Cameroon clearly show evidence of periods of extension and removal of the dense forest during the last 10 millennia: Lake Barombi-Mbo near Kumba town (Giresse et al., 1994; Maley, 1997; Maley and Brenac, 1998) and Lake Ossa near Edea town

(Reynaud-Farrera et al., 1996; Wirrmann et al., 2001). The main fluctuations can be summarized as follows.