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The study of charcoal production pits (pit kilns), excavated in central Belgium, provides information on Early and High Medieval woodland dynamics and human impact on the forest composition in the Northwest-European Lowland. Radiocarbon dating of charcoal recovered from the kilns demonstrates two different phases of charcoal production, one during the Early Medieval period (c. 650 AD–950 AD) and one during the High Medieval period (c. 1040 AD–1260 AD). Charcoal identification shows that the Early Medieval kilns are dominated by beech (Fagus sylvatica) while the younger kilns are dominated by oak (Quercus sp.), indicating a shift in woodland composition. This shift is likely to be a consequence of the earliest charcoal production activities, which resulted in the degradation of the primeval beech-dominated forest to a secondary forest dominated by oak, and intermixed with other more light-demanding taxa. [ABSTRACT FROM AUTHOR]