Large Upper Palaeolithic / Late Magdalenian open-air site east of Paris at the confluence of the Seine and Yonne. The project pioneered large-scale horizontal excavation in the western Europe Palaeolithic as well as the plotting and refitting of flint fragments as an aid to reconstructing the living conditions. Artifacts and debris of flint (including conjoined flints) and bone are found from 10,000-9000 BC in at least 15 occupations. Over 100 tent/hut habitations and 20 large hearths have been found.