This study treats a selection of combustion structures from Régismont-le-Haut (Hérault, France) and les Bossats (Seine-et-Marne, France) using a multiscalar approach. These two open-air sites provide an extremely rich archaeological documentation of, respectively, a recent phase of the Aurignacian and an early phase of the Gravettian (among others). Methodologically the study entails treating three scales of analysis, beginning with field data (macroscopic scale), followed by micromorphological investigation (meso- and microscopic scales), and finishing with geochemical analyses (molecular scale). An experimental program was also developed in order to refine our tools for interpreting our archaeological datasets, as well as to propose novel...