It is still disputed whether very old archaeological and palaeontological remains found in the Belle-10 Roche palaeocave (eastern Belgium) pertain to the Early (~1 Ma) or Middle (~0.5 Ma) Pleistocene. 11 Here, in situ-produced cosmogenic 10 Be concentrations from a depth profile in nearby sediments of the 12 Belle-Roche terrace (Amblève Main Terrace level) are used as an indirect solution of this 13 chronological issue. The distribution of 10 Be concentrations in the upper 3 m of this profile displays the 14 theoretically expected exponential decrease with depth. Assuming a single exposure episode, we 15 obtain a best fit age of 222.5±31 ka for the time of terrace abandonment. However, below 3 m, the 16 10 Be concentrations show a marked progressive increase with depth. This distinctive cosmogenic 17 signal is interpreted as the result of slow aggradation of the fluvial deposits over a lengthy interval.
est située à environ 20 km au sud de Liège, à la limite sud-occidentale de la commune de Sprimont (fig. 1). Plus précisément, elle se trouve sur le versant droit de la vallée de l'Amblève, au sud du village de Fraiture, à environ 2 km du
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