International audienceThe Mousterian open air site of Mirefleurs is located on a versant dominated by a basaltic flow, in the Allier valley (Fig. 1). Since 1970's, the site has been digged several times. This paper presents the results of several diggs located in different parts of the site. The stratigraphic data result from an intervention realized in 2003. The site of Mirefleurs delivered a lithic industry and a plentiful fauna, disrupted in various times by solifluxion (Fig. 3). Fauna is widely dominated by Horse, which shows more affinities with Equus caballus germanicus than with the shape of the upper Palaeolithic Equus caballus gallicus (Prat, 1968; Guadelli, 1987) (Tables 3 to 32). The characteristics of this animal indicate an age...