Since 1994, the archaeological survey of the Pleistocene alluvial deposits of the north of the River Yonne valley, in the southeast of the Paris Basin, has allowed the discovery of twelve Palaeolithic settlements (Lower to Upper Palaeolithic), the plotting of the evolution of the Yonne terrace system and the proposal of a chronostratigraphical hypothesis. The settlements found in the six last alluvial terraces (Soucy 1 to 6, Etigny Le Brassot PLM, Le Fond des Blanchards and Le Chemin de l'Évangile 3 at Gron, Le Brassot at Étigny) have yielded many lithic industries andfaunal assemblages preserved in fine fluviatile sequences (sands and silts). The first studies and analyses of these settlements have provided much new information about modes of occupation in the palaeovalleys (Soucy), lithic production systems (Le Fond des Blanchards and Le Chemin de l'Évangile 3 at Gron) and the variability of the lithic industries (Soucy), and strategic behaviour in acquiring and exploiting animal resources (Soucy and Le Fond des Blanchards at Gron).
Resume. Soucy 1 est le premier des six gisements du Pleistocene moyen mis au jour en contexte fluviatile sur une ancienne terrasse de l'Yonne, à Soucy (Yonne), dans une séquence stratigraphique prudemment attribuée à l'interglaciaire holsteinien. Fouillé en sauvetage en 1995, il a livré plus de 2 500 restes (lithique, faune et galets). L'analyse spatiale pratiquée sur le gisement met en évidence des zones de débitage, dès concentrations de restes fauniques et une concentration de galets bruts indiquant des secteurs d'activités différenciées. Ces éléments permettent de proposer une interprétation de la fonction du site.
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