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International audience; The cave of Bourrouilla at Arancou (Pyrénées-Atlantiques) and the rockshelter of the Grand Pastou at Sorde-l’Abbaye (Landes) are two sites in the extreme south of Aquitaine, on the edge of the Pyrenean foothills. The excavations were done within the framework of multi-year programs, using Cartesian recording methods of finds and yielded comparable stratigraphic sequences in which the Upper Magdalenian is well represented. The analytical approach taken at the two sites is analogous, in particular as regards verification of the conservation status of the different occupation layers.The Grand Pastou Rockshelter contains a rather homogeneous sedimentary sequence within which several stratigraphic units arenonetheless identifiable. The top of the sequence documents visits of the site attributable to the Terminal Magdalenian as evidencedby the presence of thumbnail scrapers and a cortical flake of flint engraved with a geometric motif. The underlying layers document aclassic Upper Magdalenian with no noticeable changes in basic contents from the base to the top.The excavations at the Bourrouilla site were located in the rear chamber of the cave, under the entrance overhang (“porch”) and infront of it. However, a karstic resurgence in the corridor prohibits stratigraphic correlations between the back room on the one hand andthe porch area and exterior on the other. Nevertheless, both sequences document occupations attributable to the Upper Magdalenian(Ensemble B in the vestibule and outside, and US [Stratigraphic Unit] 2007 in the cave). The geoarchaeological study and refittingsconfirm that the archaeological levels are well preserved, which is consistent with a series of radiocarbon dates.The comparison between archaeological data from the two sites leads to the identification of both clear similarities and differences.Both reindeer and red deer played essential roles in the hunted fauna at both sites. The snowy owl is well represented; salmon is rarein the Grand Pastou, while it is abundant in certain levels of Bourrouilla (US 2007 E), mirroring an interesting difference between thenearby sites of Durfaure and Duruthy. Lithic and bone industries in the two sites are similary, but do also present slight differences.The first similarity lies in major exploitation of raw materials available on the alluvial terraces of the nearby Gaves rivers, where flyschflint dominates. The second common point is the absence of the initial phases of the operating chains. Although the basic tools andthe preponderance of bladelet tools constitute two other similarities, it is clear that some tools appear only in one series: Hamburgianpoints in the Grand Pastou, Teyjat points and backed bladelets with Couze-type truncations in Bourrouilla. In addition, the latter site(Ensemble B) documents an independent bladelets production chain from carenoïds nucleus.The bone industry of both deposits has mainly technological and typological similarities. In particular, the practice of double groovingfor “splinter” blank removal was employed on cervid (both reindeer and red deer) antler and bone, as well as the presence of raremicro-harpoons in the archaeological series. In Bourrouilla, elements made of deer and reindeer antlers bear the stigmata of a percussionextraction, although it is impossible to identify the aims of this method.For their part, the personal ornaments and portable art objects display strong divergences, even if they are part of the spectrum of classicsymbolic productions of the Upper Magdalenian. The personal ornaments of the Grand Pastou are marked by the presence of numerousshells, which are very rare in Bourrouilla. In the latter site, it is noted that perforated red deer canines do not appear everywhere andare notably absent from the base of US 2007. The portable art of Bourouilla also offers a diversity and richness that contrasts with thepoverty of such material in the Grand Pastou. The presence of a series of pendants and decorated smoothers, made on split ribs, proofof remarkable technical mastery, is the central element in the symbolic production at the site. However, the corpus is more varied,includingboth prepared and unprepared organic and lithic blanks, and documenting varying levels of technical mastery. In this aspectof material culture, the only common point between Bourrouilla and Grand Pastou is the use of snowy owl bones in the manufactureand the decoration of tubes.The deposits correspond to different seasons of occupations: cold season in the Grand Pastou, where the occupation extended into thebeginning of the warm season, versus the warm season until the autumn at Bourrouilla, where the catching of salmon was possible atthe time of their run upstream to the Pyrenean spawning areas. It remains, however, difficult to interpret data which probably reflectslight chronological differences and nuances in the function of the sites accentuated by the relative representativeness of the areassearched in relation to the areas occupied and the activities practiced.; La grotte de Bourrouilla à Arancou (Pyrénées-Atlantiques) et l'abri du Grand Pastou à Sorde-l'Abbaye (Landes) sont deux gisements de l'extrême sud de l'Aquitaine, situés dans le piémont pyrénéen ou à son immédiate proximité. Ils font l'objet de fouilles programmées mettant en oeuvre des méthodes d'enregistrements fins des données de terrain et livrent des séquences stratigraphiques comparables où le Magdalénien supérieur est bien représenté. La démarche adoptée sur les deux sites présente des analogies, notam-ment quant à la vérification de l'état de conservation des différents niveaux d'occupation. Le croisement des données archéologiques issues des deux sites conduit à identifier des parentés évidentes et des différences. Si le cerf (Cervus elaphus) tient une place essentielle dans la faune chassée sur les deux sites et si la chouette harfang (Bubo scandiacus) est bien représentée, le saumon (Salmo salar) est rare au Grand Pastou alors qu'il est abondant dans certains niveaux de Bourrouilla. Les équipements lithiques et osseux sont proches mais offrent eux aussi de légères différences. Pour leur part, la parure et l'art mobilier témoignent de fortes divergences, même s'ils s'inscrivent dans le spectre des productions symboliques classiques du Magdalénien supérieur. Au-delà du fait que les gisements correspondent à des saisons d'occupations différentes, il reste difficile d'interpréter les données reflétant sans doute de légers décalages chronologiques et des nuances dans la fonction des sites, qu'accentue la représentati-vité toute relative des surfaces fouillées par rapport aux aires occupées et aux activités pratiquées. Mots-clés : sud de l'Aquitaine, Magdalénien supérieur, cerf, harfang, lamelles à dos, art mobilier.

International audience; The cave of Bourrouilla at Arancou (Pyrénées-Atlantiques) and the rockshelter of the Grand Pastou at Sorde-l’Abbaye (Landes) are two sites in the extreme south of Aquitaine, on the edge of the Pyrenean foothills. The excavations were done within the framework of multi-year programs, using Cartesian recording methods of finds and yielded comparable stratigraphic sequences in which the Upper Magdalenian is well represented. The analytical approach taken at the two sites is analogous, in particular as regards verification of the conservation status of the different occupation layers.The Grand Pastou Rockshelter contains a rather homogeneous sedimentary sequence within which several stratigraphic units arenonetheless identifiable. The top of the sequence documents visits of the site attributable to the Terminal Magdalenian as evidencedby the presence of thumbnail scrapers and a cortical flake of flint engraved with a geometric motif. The underlying layers document aclassic Upper Magdalenian with no noticeable changes in basic contents from the base to the top.The excavations at the Bourrouilla site were located in the rear chamber of the cave, under the entrance overhang (“porch”) and infront of it. However, a karstic resurgence in the corridor prohibits stratigraphic correlations between the back room on the one hand andthe porch area and exterior on the other. Nevertheless, both sequences document occupations attributable to the Upper Magdalenian(Ensemble B in the vestibule and outside, and US [Stratigraphic Unit] 2007 in the cave). The geoarchaeological study and refittingsconfirm that the archaeological levels are well preserved, which is consistent with a series of radiocarbon dates.The comparison between archaeological data from the two sites leads to the identification of both clear similarities and differences.Both reindeer and red deer played essential roles in the hunted fauna at both sites. The snowy owl is well represented; salmon is rarein the Grand Pastou, while it is abundant in certain levels of Bourrouilla (US 2007 E), mirroring an interesting difference between thenearby sites of Durfaure and Duruthy. Lithic and bone industries in the two sites are similary, but do also present slight differences.The first similarity lies in major exploitation of raw materials available on the alluvial terraces of the nearby Gaves rivers, where flyschflint dominates. The second common point is the absence of the initial phases of the operating chains. Although the basic tools andthe preponderance of bladelet tools constitute two other similarities, it is clear that some tools appear only in one series: Hamburgianpoints in the Grand Pastou, Teyjat points and backed bladelets with Couze-type truncations in Bourrouilla. In addition, the latter site(Ensemble B) documents an independent bladelets production chain from carenoïds nucleus.The bone industry of both deposits has mainly technological and typological similarities. In particular, the practice of double groovingfor “splinter” blank removal was employed on cervid (both reindeer and red deer) antler and bone, as well as the presence of raremicro-harpoons in the archaeological series. In Bourrouilla, elements made of deer and reindeer antlers bear the stigmata of a percussionextraction, although it is impossible to identify the aims of this method.For their part, the personal ornaments and portable art objects display strong divergences, even if they are part of the spectrum of classicsymbolic productions of the Upper Magdalenian. The personal ornaments of the Grand Pastou are marked by the presence of numerousshells, which are very rare in Bourrouilla. In the latter site, it is noted that perforated red deer canines do not appear everywhere andare notably absent from the base of US 2007. The portable art of Bourouilla also offers a diversity and richness that contrasts with thepoverty of such material in the Grand Pastou. The presence of a series of pendants and decorated smoothers, made on split ribs, proofof remarkable technical mastery, is the central element in the symbolic production at the site. However, the corpus is more varied,includingboth prepared and unprepared organic and lithic blanks, and documenting varying levels of technical mastery. In this aspectof material culture, the only common point between Bourrouilla and Grand Pastou is the use of snowy owl bones in the manufactureand the decoration of tubes.The deposits correspond to different seasons of occupations: cold season in the Grand Pastou, where the occupation extended into thebeginning of the warm season, versus the warm season until the autumn at Bourrouilla, where the catching of salmon was possible atthe time of their run upstream to the Pyrenean spawning areas. It remains, however, difficult to interpret data which probably reflectslight chronological differences and nuances in the function of the sites accentuated by the relative representativeness of the areassearched in relation to the areas occupied and the activities practiced.; La grotte de Bourrouilla à Arancou (Pyrénées-Atlantiques) et l'abri du Grand Pastou à Sorde-l'Abbaye (Landes) sont deux gisements de l'extrême sud de l'Aquitaine, situés dans le piémont pyrénéen ou à son immédiate proximité. Ils font l'objet de fouilles programmées mettant en oeuvre des méthodes d'enregistrements fins des données de terrain et livrent des séquences stratigraphiques comparables où le Magdalénien supérieur est bien représenté. La démarche adoptée sur les deux sites présente des analogies, notam-ment quant à la vérification de l'état de conservation des différents niveaux d'occupation. Le croisement des données archéologiques issues des deux sites conduit à identifier des parentés évidentes et des différences. Si le cerf (Cervus elaphus) tient une place essentielle dans la faune chassée sur les deux sites et si la chouette harfang (Bubo scandiacus) est bien représentée, le saumon (Salmo salar) est rare au Grand Pastou alors qu'il est abondant dans certains niveaux de Bourrouilla. Les équipements lithiques et osseux sont proches mais offrent eux aussi de légères différences. Pour leur part, la parure et l'art mobilier témoignent de fortes divergences, même s'ils s'inscrivent dans le spectre des productions symboliques classiques du Magdalénien supérieur. Au-delà du fait que les gisements correspondent à des saisons d'occupations différentes, il reste difficile d'interpréter les données reflétant sans doute de légers décalages chronologiques et des nuances dans la fonction des sites, qu'accentue la représentati-vité toute relative des surfaces fouillées par rapport aux aires occupées et aux activités pratiquées. Mots-clés : sud de l'Aquitaine, Magdalénien supérieur, cerf, harfang, lamelles à dos, art mobilier.