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Sedimentological and geochemical ana- lyses and 14C dating were performed for a sedimentary core sample from the Lope 2 marsh in the northern zone of Gabon’s Lope National Park. The results produced a division of the core sample into three main units. The basal part of the core sample was dated to 2,320 years cal BP. At this time, the Lope 2 marsh was a topo- graphic hollow that flooded sporadically during the rainy season. This unit corres- ponds to a soil formation of clay, quartz and highly decomposed organic matter. The upper boundary of this unit corres- ponds to the end of the climatic deterio- ration that affected central Africa around 2,500 years BP. The second unit represents the period from 2,320 to 585 years cal BP. This shows a gradual decrease in the flow of quartz that reflects the increasing rela- tive density of the marsh vegetation as the climate became more humid. The organic matter in this unit is of mixed origin, rela- tively abundant and with a high content of refractory material. The third unit, repre- senting the period from 585 years cal BP to the present, shows plant cover asso- ciated with developing marshland (which began in unit 2) that was sustained by the humid climate. The organic matter here is rich in biological material.

HOW EVOLVING HOLOCENE LANDSCAPES ARE FILLING IN THE VALLEY BOTTOMS OF GABON’S LOPÉ NATIONAL PARK IN THE MID OGOOUÉ VALLEY