The lithic industry with shouldered points and truncated backed bladelets from the rockshelter of Chinchon 1 in the Vaucluse has been variously interpreted over the past few decades : some authors clearly see it as belonging to an ultimate, classic, phase of the final Magdalenian, whereas others link it just as clearly to an early, Italic, phase of the Tardigravettian. The results of stratigraphic, sedimentological and palaeontological analyses speak for an early date for this complex, a date that had hitherto eluded absolute dating. Here we present a series of new chronological markers for this episode, subjected to Bayesian analysis and modelling. We examine the chronological relationship between these new data and the Salpetrian Tardisol...