Abstract
The demise of Neanderthals and their interaction with dispersing anatomically modern human populations remain some of the most contentious issues in palaeoanthropology. The Châtelperronian, now generally recognized as the first genuine Upper Palaeolithic industry in Western Europe and commonly attributed to the Neanderthals, plays a pivotal role in these debates. The Neanderthal authorship of this techno-complex is based on reported associations of Neanderthal skeletal material with Châtelperronian assemblages at only two sites, La Roche-à-Pierrot (Saint-Césaire) and the Grotte du Renne (Arcy-sur-Cure). The reliability of such an association has, however, been the subject of heated controversy. Here we present a detailed taphonomic, spatial and typo-technological reassessment of the level (EJOP sup) containing the Neanderthal skeletal material at Saint-Césaire. Our assessment of a new larger sample of lithic artifacts, combined with a systematic refitting program and spatial projections of diagnostic artifacts, produced no reliable evidence for a Neanderthal-Châtelperronian association at the site. These results significantly impact current models concerning the Middle-to-Upper Palaeolithic transition in Western Europe and force a critical reappraisal of who exactly were the makers of the Châtelperronian.
Introduction
Documenting the emergence of traits commonly considered as proxies for ‘behavioural modernity’ remains one of the most debated research challenges in Palaeolithic archaeology. Over the last two decades, new analyses in Africa have pushed back the earliest occurrences of such evidence1–12, which were previously thought to be coincident with the Middle-to-Upper Palaeolithic transition in Western Europe. Despite intense dispute as to whether such evidence is unique to anatomically modern human populations, it now appears clear that Middle Palaeolithic Neanderthal populations across their known range also made and used bone tools13,14, sourced and processed pigments15–18, potentially buried their dead19–25, and probably possessed elements of personal ornamentation26–29.
The Châtelperronian, commonly assumed to be one of the final cultural manifestations of Neanderthals in Western Europe, is pivotal to this debate. Its unique features combining blade and bladelet technologies alongside personal ornaments, bone tools and considerable pigment use has simultaneously been interpreted as support either for the acculturation of final Neanderthal populations by dispersing anatomically modern human groups30–36 or the independent emergence of cultural innovations amongst the former37–40. The Neanderthal authorship of the Châtelperronian is, however, based on reported direct associations of Neanderthal skeletal remains with Châtelperronian cultural material at only two sites — scattered teeth, a temporal bone and bone fragments from the lowermost Châtelperronian levels of the Grotte du Renne at Arcy-sur-Cure32,41,42 and a partial Neanderthal skeleton in a level (EJOP sup) attributed to the Châtelperronian at La Roche-à-Pierrot, Saint-Césaire43–45. However, important reservations persist concerning the reliability of the Neanderthal-Châtelperronian association at both sites46–50.
Despite the paramount importance of Saint-Césaire for almost all models for the Middle-to-Upper Paleolithic transition in Western Europe, the limited amount of published information concerning the site’s lithic assemblages51–54 makes it difficult to evaluate the reliability of the reported stratigraphic association of Neanderthal skeletal elements with diagnostic Châtelperronian artefacts. Here we report a detailed spatial, taphonomic and techno-typological reassessment of the level containing the partial Neanderthal skeleton designed to thoroughly re-evaluate its cultural attribution and stratigraphic integrity and ultimately discuss the context of the Neanderthal skeletal remains.
La Roche-à-Pierrot, Saint-Césaire
Located in the Charente-Maritime department of southwestern France and excavated by F. Lévêque for 12 uninterrupted seasons between 1976 and 1987, the site of La-Roche-à-Pierrot, Saint-Césaire lies at the base of an Upper Turonian limestone cliff (see Supplementary Information for details of site history, Supplementary Figs 1 and 2). According to the original excavators, this small collapsed rockshelter documents the complete Mousterian-Châtelperronian-Aurignacian cultural sequence55.
Two levels reported as containing Châtelperronian cultural material were identified during excavations; an upper pale yellow-orange level (EJOP sup) with abundant angular blocks underlain by a level of the same colour (EJOP inf) but with fewer blocks and a more clayey matrix, whose base (EJOP inf base) contained numerous large blocks. It is also important to note that prior to the distinction of these subdivisions the material recovered throughout the pale yellow-orange level was noted simply as EJOP, including at the time the Neanderthal remains were discovered.
While Lévêque’s presentation of the lithic material from EJOP sup concentrated solely on the 305 retouched tools recovered from all squares where this level was identified (32 sq. metres), a more recent analysis53,54 focused on a larger sample of 2594 flakes greater than 3 cm, 193 cores and 201 tools combining all four stratigraphic designations (EJOP, EJOP inf base, EJOP inf and EJOP sup). Importantly, with the help of Lévêque and reference to information in the field notebooks (e.g., artefact altitudes, sedimentological observations), an unspecified amount of material from the undifferentiated EJOP level was reassigned to EJOP inf or sup53,54. This reanalysis resulted in the reaffirmation of Lévêque’s original attribution of EJOP sup to the Châtelperronian and at the same time noted that: (1) Mousterian and Châtelperronian artefacts do not significantly differ in terms of surface alterations, (2) EJOP inf is more appropriately defined as Mousterian, (3) EJOP sup nevertheless still portrays a considerable Mousterian ‘aspect’, and (4) that overall it remains difficult to discern whether the particular composition of the Châtelperronian of Saint-Césaire is cultural or the product of post-depositional mixing.
Considerable research concerning Châtelperronian lithic technology has since demonstrated this techno-complex to consist of a fully Upper Paleolithic blade/bladelet technology50,55–61 and that the presence of typical Mousterian artefacts can be attributed to post-depositional admixture from underlying deposits57,62. Additionally, in taphonomically tested contexts (e.g. Quincay, Canaule II), Mousterian tool types were found to be manufactured uniquely on by-products from systematic blade production and not blanks issuing from any of the now well-documented Mousterian flake production systems59,63,64. These recent advances in the techno-typological definition of the Châtelperronian form the basis of our reanalysis of level EJOP sup, which aimed to test both the cultural homogeneity of EJOP sup and whether there exists any reliable evidence for a Neanderthal-Châtelperronian association at Saint-Césaire.
Materials and Methods
To properly assess its cultural homogeneity, we combined vertical and horizontal projections of piece-plotted artefacts in order to reconstruct the largest reliable assemblage of lithic artefacts from EJOP sup. This reconstituted assemblage was then the focus of a detailed typo-technological analysis designed to isolate potentially different chrono-cultural components and explore their spatial relationship to the Neanderthal remains. Finally, we integrated a systematic conjoining program with an evaluation of lithic surface alterations, including a targeted analysis using confocal microscopy, to investigate the potential reworking and redistribution of the EJOP sup lithic material. Note that nearly 1000 person-hours were necessary to recondition the remaining unwashed, unmarked, and un-inventoried lithic objects (approximately 90% of the total lithic material) from the site’s Upper Palaeolithic levels, the Châtelperronian included.
Reconstituting the EJOP sup lithic assemblage
Up until now, the absence of spatial projections of the archaeological material substantially hindered our ability to evaluate both the Saint-Césaire stratigraphy and the context of the Neanderthal skeletal material. Fortunately, Lévêque marked the coordinates directly on each piece-plotted artefact (Supplementary Information, Supplementary Fig. S4). However, only approximately 15% of over 42,000 lithic objects greater than 1.5 cm from the various stratigraphic designations of EJOP (i.e. base, inf, sup, or undifferentiated) were piece-plotted during excavations. Our spatial analysis of all of the piece-plotted objects demonstrates that, beginning from line 6, the Upper Palaeolithic levels, including those attributed to the Châtelperronian, slope significantly south-east – north-west, where they become compressed and intercalated (Fig. 1). This inevitably led to substantial mixing and significant difficulties in the stratigraphic attribution of the material during excavations in the down slope area of the site (i.e. lines 6 to 9), a problem readily admitted by the original excavators, and further complicated by the fact that the site was not systematically excavated horizontally following the levels.
On the other hand, in lines 2 to 5, which include the Neanderthal skeletal material, the most consequential archaeological levels are relatively horizontal, sloping only slightly towards the cliff and, to a lesser extent, toward the south-west (Fig. 2). In order to best avoid any artificial mixing of material from different levels and to have the most representative sample possible, we concentrated our analysis on the material recovered from this 17 m² area, approximately the same as previously studied53,54.
Separating the two major EJOP sub-levels (EJOP inf and sup) during excavations proved difficult, which is equally evident from our projections of the lithic material, with nearly 50% of the piece-plotted material attributed to an undifferentiated EJOP (n = 9211). Our fine-grained stratigraphic and spatial analyses using projections of the piece-plotted material allowed a much larger portion of the undifferentiated EJOP assemblage to be re-attributed to one of the two sub-levels (EJOP inf or sup) with greater precision and confidence than was previously possible, thus augmenting the piece-plotted EJOP sup sample by 40% (Fig. 2) compared to prior analyses. These reattributions equally allowed us to assign or exclude non-piece plotted material in the retained zone to EJOP sup based on the newly defined vertical limits of this level in each 50 cm by 50 cm sub-square (Supplementary Information, Supplementary Fig. S3). Here it is important to note that the lower limits of each spit reassigned to EJOP sup, as well as those originally attributed by the excavators to this unit, fall within the sterile band and above any potential stratigraphic disconformity with the underlying Mousterian (see Supplementary Information, Supplementary Fig. S4). As such, the possibility of artificially inflating the Mousterian component of the reconstituted EJOP sup sample is extremely unlikely. The overall analysed sample from EJOP sup comprises 4555 lithic artefacts greater than 1.5 cm, of which 694 were piece-plotted during excavations, a sample some 70% larger than previously reported (the complete database of piece-plotted material with original and reattributed level assignments is available as Dataset 1).
Additionally, Lévêque’s excavations notebooks (Supplementary Information, Supplementary Fig. S4) record the coordinates for what are, given the date, almost certainly the first 10 human remains, mainly teeth, exposed prior to the removal of the remaining skeletal elements in a 70-cm diameter plastered sediment block (Supplementary Information, Supplementary Fig. S5). These points therefore provide the uppermost limits of the Neanderthal skeletal material and allow us to reposition of this approximately 20 cm thick block of sediment in space.
Techno-typological and taphonomical analysis of EJOP sup
In order to most reliably describe the techno-typological composition of EJOP sup and separate its components, lithic artefacts were designated as Châtelperronian or Middle Palaeolithic based on well-defined production objectives and morphological criteria available in the most recent and complete technological analyses of these techno-complexes. If objects did not fulfil either the well-established techno-typological criteria for the Châtelperronian55–61 or the various production methods or tool types typical of the Middle Palaeolithic64–72 they were left as ‘indeterminate’. For a table resuming the criteria for each diagnostic artefact class see Table S1 in the Supplementary Information. Additionally, we recorded macroscopic surface states and edge alterations for all lithic objects from the retained zone, complemented by a targeted analysis using 3D micrographs produced with a confocal microscope of a sample of material in the immediate vicinity of the Neanderthal skeletal remains (for the analytical protocol see Supplementary Information, Supplementary Figs 17–18).
Results
Of the piece-plotted material attributed during excavations to EJOP sup (n = 696), 173 are diagnostic, and evince an assemblage composed primarily of Middle Palaeolithic cultural material (88.4% of the diagnostic pieces, n = 153) accompanied by a much smaller Châtelperronian component (11.6%, n = 20). The heavily Middle Palaeolithic character of this level is equally apparent with our re-attributed piece-plotted material (n = 975), with the proportions of diagnostic cultural material remaining relatively stable (Middle Palaeolithic, 84.6%, n = 237; Châtelperronian, 15.4%, n = 43). When the non-piece plotted material is included, these proportions shift only moderately, as more unretouched pieces are considered. Despite over 70% of the overall EJOP sup sample being broken or damaged, we were able to confidently assign 32% (n = 1471) to either the Middle Palaeolithic or Châtelperronian, evincing an assemblage comprising an extremely limited quantity of Châtelperronian cultural material (n = 88, 6%, including 12 Châtelperronian points) mixed with a considerably more substantial Middle Palaeolithic component (n = 1380, 94%, see Supplementary Information, Supplementary Tables S2 and S3). Clear evidence exists for use of the Levallois, Discoid and Kostenki/truncated-facetted flake production methods, accompanied by denticulates, notches, side-scrapers and a much larger number of pseudo-tools with mechanical retouch, a preservation pattern noted by Levêque himself (Figs 3 and 4). Photographs of the entire analysed lithic assemblage can be consulted in the Supplementary Information as Supplementary Figs 6–16. Finally, considering the strict selection criteria employed, it is important to note that the proportions of Middle Palaeolithic artefact types likely represent very conservative estimates. In the end, regardless the assemblage considered – either Levêque’s original attributions or our own, and whether only piece-plotted or all material is included – EJOP sup is best described as comprising two distinct techno-typological components: a dominant Middle Palaeolithic and an extremely limited Châtelperronian.
It is equally noteworthy that the Mousterian tool component of EJOP sup involves uniquely typical Mousterian blank types and not by-products of blade manufacture. As noted by Bachellerie57 and Roussel et al.60, respectively, for several open-air sites in the southwest of France and the Quinçay rockshelter sequence, Middle Palaeolithic type tools in Châtelperronian assemblages are made on by-products of blade production. At Saint-Césaire, Mousterian and Châtelperronian tools are produced on blanks following independent production methods, in other words, all Mousterian retouched tools are made on typical Mousterian flake blanks.
Interpreting the mix of Mousterian and Châtelperronian components in EJOP sup
We used spatial projections of piece-plotted material, surface alterations and the systematic conjoining of lithic fragments to explore the stratigraphic context of the two techno-typological components of EJOP sup. Detailed projections clearly reveal the layer’s Châtelperronian and Middle Palaeolithic components to be inseparable vertically or horizontally (Fig. 5) throughout the approximately 20 cm thick layer, with no clear lens of Châtelperronian material preserved at the summit. This pattern definitively rules out the possibility of a previously undetected stratigraphic superimposition of Mousterian and Châtelperronian lithic material within EJOP sup. As noted above, the clear presence of a sterile band between the underlying Mousterian level (EGPF and EJOP inf) and EJOP sup also effectively rules out the migration of Middle Palaeolithic material directly from the former into the latter (Fig. 2).
In terms of preservation, two thirds of the lithic material greater than 4 cm from EJOP sup portrays some form of edge damage (66%), with 14% bearing heavy alternate edge damaged, percussed ridges and lustred surfaces (Supplementary Information, Supplementary Table S4). This is in stark contrast with both the overlying Aurignacian and underlying EJOP inf and final Mousterian occupations53,54,73 and was clear to Lévêque55 himself. An earlier spatial analysis74 also demonstrated “naturally” modified pieces to cluster in the upslope area near the cliff, particularly in the central area (squares E4/5/6 and G4/5/6) where the Neanderthal skeleton was found. Importantly, and as previously suggested53,54, our analysis produced no clear correlation between surface states and the different techno-typological components of EJOP sup. In other words, the Mousterian and Châtelperronian material comprise both relatively fresh and heavily altered pieces. Furthermore, confocal microscopy reveals lithic artefacts in the vicinity of the Neanderthal skeletal remains to bear surface alterations directly comparable to those sampled from deposits in the immediate surroundings of the site (i.e. secondary slope deposits, colluvial deposits, see Supplementary Information, Supplementary Fig. S18). Roughness measurements show a wide variability of surface alterations among artifacts from an extremely limited volume (i.e., a 2 cm spit in a 50 by 50 centimeter sub-square), strengthening the idea that EJOP sup underwent multiple complex post-depositional processes that likely modified the spatial organization of the material.
The systematic testing of conjoinable flake or blade fragments has been shown to be a highly efficient taphonomic tool for testing the displacement of both lithic and faunal material, and hence provides a clear means for assessing the potential post-depositional reworking of assemblages74–76. All broken pieces with complete breaks longer than 15 mm, including non-piece plotted artefacts, clearly identifiable as proximal, mesial and distal fragments from the entire excavated surface (32 sq. meters) and assigned to all the various stratigraphic distinctions of EJOP were systematically tested for break conjoins (See Supplementary Information for methodology, Supplementary Fig. S20). This entailed verifying nearly 700,000 possible connections between 1441 fragments (Supplementary Information, Supplementary Table S6, Fig. S19). In the end, only 29 connections (Supplementary Information, Supplementary Table S7), nearly all of which follow the double slope of the deposits (Fig. 6), were found for a success rate of 4%. Break conjoins involve an average artefact displacement ranging from several centimetres to several metres.
To our knowledge, this is the first time that a systematic break conjoining experiment has been applied to a context, archaeological or experimental, with a considerable flake component, meaning that comparable data is unfortunately lacking. However, several pertinent observations are still possible. First, the presence of a considerable number of cortical flakes and cortical fragments (primarily broken during detachment) in immediately available Senonian flint, alongside numerous cores and evidence for all stages of the various reduction sequences, plead in favour of a considerable portion of lithic production having been carried out on-site. Second, the excavated zone likely represents a large portion of the original occupation, making it extremely unlikely that all the missing fragments remain to be found in the limited area where EJOP sup is preserved in the upslope unexcavated zone. Third, the very limited number of intentional fractures observed during our technological analysis rules out a particular techno-economic behaviour whereby broken objects were consistently exported and/or imported.
Given this combination of arguments, it would be reasonable to anticipate a considerably higher success rate than the surprisingly low 4%. While the percentage of conjoins does not in and of itself demonstrate the disturbance of an archaeological layer, when compared to other systematic refitting analyses (see Supplementary Table S8), albeit from Upper Palaeolithic contexts, the success rate for Saint-Césaire is on the order of 2 to 3 times lower than demonstrably redistributed or mixed contexts (Corbiac-Vignoble II, Le Piage, Caminade) and nearly 9 times lower for the exceptionally well-preserved open-air site of Canaule II. Only the success rate for Roc de Combe is comparable; however, the excavated surface was considerably smaller than that of Saint Césaire.
Unlike previous refitting work on the faunal assemblages from Saint-Césaire, which focused on testing the inter-level movement of artefacts77, our systematic refitting programme was designed to address the preservation of connections within the various lithostratigraphic units of EJOP. While this previous analysis produced no evidence of any important post-depositional disturbance of the Saint-Césaire sequence, this uniquely concerned inter-level admixture and not the overall integrity and homogeneity of EJOP sup itself. This important difference in taphonomic approaches effectively accounts for what could be perceived as contradictory results between the two studies.
Discussion and Conclusion
Our analysis shows EJOP sup to contain an extremely limited quantity of Châtelperronian cultural material clearly mixed with an overwhelmingly Middle Palaeolithic component. Moreover, these two assemblage components depict no relic stratigraphic superimposition whereby the Châtelperronian would occupy the summit of EJOP sup; both components (diagnostic non-retouched lithic material included) are fully intermixed. Arguments whereby EJOP sup would represent an ‘archaic Châtelperronian’ with a clear, substantially larger Mousterian component, as originally advanced by Lévêque51, would, based on recent analyses and the results presented here, not only require special pleading but be totally incongruent with well-contextualised, taphonomically-tested Châtelperronian occurrences that systematically lack a Mousterian component. In fact, recent comparisons of available tool counts from what were considered the most secure Châtelperronian contexts revealed EJOP sup to be the sole clear outlier in terms of its Mousterian tool component36,57. It is also instructive to note that the sidescrapers from EJOP sup (i.e. Fig. 4. n° 1, 3, 4.) find no equivalent in any known taphonomically-secure Châtelperronian context. In this same respect, the EJOP sup Mousterian component depicts absolutely no Upper Palaeolithic ‘tendencies’ (i.e., Upper Palaeolithic tool types, backed knives, elongated flake production, soft-hammer percussion) commonly advanced as support for a local Mousterian origin for the Châtelperronian36,78.
The most parsimonious explanation for the composition of the EJOP sup assemblage is the post-depositional redistribution of what was likely a very brief Châtelperronian stop-over, which have been shown to be frequent in the region65,76, within one or several different, considerably more consequential Mousterian occupations, themselves equally affected by these same processes. Several lines of evidence support this conclusion. First, the heavily reworked and mixed nature of this level is borne out by the condition of the assemblage itself. Second, the near total absence of break conjoins despite a systematic refitting program, which is equally compatible with results reported for the highly fragmented EJOP sup faunal component77, where of over 1000 tested specimens only 2 green bone fractures connections were found alongside four, less taphonomically-relevant dry bone fractures, all of which derive from the same sub-square. Finally, a diaclase, still evident in the cliff face (Supplementary Information, Supplementary Fig. S1), combined with the presence of several thousand geofacts of Santonian flint that outcrops directly above the site (Supplementary Information, Supplementary Fig. S21), strongly suggest the potential introduction of archaeological material from the overlying plateau. This likelihood is further supported by the confocal microscopy results and consistent with the double slope of the EJOP sup deposits, which would go some way in explaining the extremely small success rate for the systematic refitting programme.
Currently, apart from the mention of several intact articulations or elements in anatomical position, no spatial data is available concerning the precise organisation or bone taphonomy of the heavily fragmented and crushed Neanderthal skeletal material44,45,79. The reworking of the deposit was also likely responsible for the truncation, removal and or destruction of the partial Neanderthal skeleton, a probability reinforced by the fact that the majority of the naturally modified lithic material was found in the area containing the skeleton80. It is equally interesting to note that, while practically the entire left cranial-mandibular block is missing44,45, several teeth reported in the excavation notebooks (see Supplementary Information, Supplementary Information Fig. S5) as left molars and premolars were found clustered near the majority of the skeletal material. This would suggest that at least the other half of the skull, if not the missing infra-cranial elements, were probably originally present, rendering the hypothesis of a secondary burial of a partial skeleton45 difficult to maintain. With this being the case, three potential scenarios for the deposition and hence chrono-cultural association of the Neanderthal skeletal remains can be imagined; either they were deposited (1) subsequent to the reworking event and are thus Aurignacian in age81, (2) they were associated with a brief Châtelperronian occupation, or (3) they represent the remnants of a reworked Mousterian ‘burial’.
In the post-reworking (Aurignacian) scenario, we would expect the sediments removed with the plastered block, and perhaps, the immediately surrounding sediment to potentially contain some Aurignacian cultural material. This is not the case - the block contained an extremely limited number of lithics, with all diagnostic material being techno-typologically Mousterian in nature (Supplementary Table S5). Moreover, the lack of stones in the ‘burial’ area supporting the presence of the pit81 is irrelevant in that multiple, similar-sized areas lacking stones were documented across the excavated surface of EJOP sup80. Finally, this scenario, although not impossible, would be inconsistent with almost all current models for the Middle-to-Upper Palaeolithic transition in Western Europe, where anatomically modern human groups are commonly assumed to be the authors of the Aurignacian (see82 for a recent synthesis).
Separating the second two scenarios (a Châtelperronian versus Mousterian association) based on the evidence available would also appear highly speculative. The summit of the sediment block containing the Neanderthal remains does, however, appears to lie towards the base of EJOP sup or at the summit of the sterile band (Fig. 7), which would be compatible with the extremely limited quantity of lithic material recovered from the plastered block. This potentially suggests the introduction of the remains to pre-date the reworking event (or events) that would have partially disturbed the skeleton, eroded the summit of EJOP sup and mixed the overlying archaeological material. With this being the case, associating the remains with either cultural component is impossible. With that said and to be as clear as possible, our argument is not that because the Neanderthal skeleton cannot be reliably associated with Châtelperronian cultural material; ergo, it must be Mousterian, rather we maintain that faced with a clearly reworked archaeological context and significant ambiguity surrounding when the Neanderthal skeletal material was introduced, it is impossible to advance any reliable chrono-cultural association whatsoever.
In sum, given the demonstrably mixed nature of EJOP sup and the impossibility of attributing the Neanderthal remains to a given techno-complex, the Neanderthal-Châtelperronian association at Saint Césaire should be considerable unreliable at best. Any Châtelperronian affiliation would therefore be based uniquely on a sole radiocarbon age obtained from the Neanderthal skeleton33. However, given both the low collagen content of the sample coupled with persistent challenges obtaining reliable dates from this period83,84, this age should be viewed with considerable caution. New excavations, which include a concerted geo-archaeological and micro-morphological approach, should help shed critical new light on the complex sedimentary and post-depositional processes responsible for the formation of EJOP sup. The example of Saint Césaire ones again highlights how a detailed taphonomic analysis can significantly impact both interpretations and their relevance for sociocultural models for the Middle-to-Upper Palaeolithic transition in Western Europe.
Electronic supplementary material
Acknowledgements
This work was carried out as part of a research project (dir. J.-G. Bordes) financed by the DRAC of Poitou-Charentes. We are particularly indebted to C. Schwab (MAN, Paris) for authorisation to work with the Saint-Césaire lithic assemblages as well as J. Buisson-Catil, J. Primault and F. Blanchet (SRA Poitou-Charentes) for assuring that research could be carried out in the most productive circumstances possible. The OpenAccess publication was financed by the NATCH project (dir. J.-P. Faivre), the PACEA laboratory of the University of Bordeaux, and the LaScArBx (Agence Nationale de la Recherche as part of the Investissements d’avenir – ANR-10-LABX-52). We are equally grateful to E. Morin for assuring access to Lévêque’s field notebooks, as well as providing several photos and constructive comments, F. Lavaud-Girard for discussions concerning Lévêque’s excavations at the site, S. Ducasse for artefact illustrations and A. Verna for artefact photos. We would also like to thank V. Armitano and B. Albouy of Paleosite (Saint Césaire) for their help with various logistical aspects. The work presented here also benefitted from discussions with A. Delagnes, J. Jaubert, M.-C. Dawson, and I. Crevecoeur. Finally, the constructive comments of the reviewers, especially J. Zilhao, considerably improved the manuscript.
Author Contributions
The revision of Lévêques excavations at Saint Césaire was carried out in the framework of a project directed by J.G.B., who also acquired the necessary funding. B.G., F.B., S.C., E.D., J.P.F., A.M., N.T. and J.G.B. contributed to different aspects of research design, including taphonomic analyses and sorting of material. B.G., F.B., J.P.F., N.T. and J.G.B. analysed the lithic assemblages. B.G., F.B., S.C. and J.G.B. carried out the refitting program. S.C. studied the raw materials and A.G. performed confocal microscopy. B.G., F.B., E.D., N.T. and J.G.B. wrote the paper and all co-authors contributed to the final version of the manuscript.
Competing Interests
The authors declare no competing interests.
Footnotes
Publisher's note: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Electronic supplementary material
Supplementary information accompanies this paper at 10.1038/s41598-018-33084-9.
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