New Perspectives on Sincu Bara, a First Millennium Site in the Senegal Valley

The 67-ha site of Sincu Bara was discovered and extensively excavated in the 1970s. Three primary aspects of its archaeological interest were its vast size, its location in the Middle Senegal Valley, where some of the earliest regional polities in West Africa arose, and the extensive and diverse assortment of copper-based metal artifacts it produced. Deposits with brass appeared to be associated with radiocarbon dates as early as the fifth century AD. It appeared that most of the deposits related to a single, long-lasting occupation by people who arrived with sophisticated copper-based metallurgy in the fifth century and remained at least until the eleventh century, without discernible modification in their material culture. Results of new excavations in 1991–1992 indicate that this interpretation must be substantially modified, since considerable change in material culture, including the introduction of copper-based metals between AD 800 and AD 900, has now been documented. This article summarizes the data from these new excavations and suggests that earlier interpretations were based largely on material from disturbed, severely mixed deposits, which gave a false picture of homogeneity through time.Les soixante sept héctares constituant le gisement du Sincu Bara étaient découverts et fouillés dans les années soixante dix. Son intérêt archéologique est lié aux trois aspects: sa grande superficie, sa location dans la vallée moyenne du Sénégal où les premières unités politiques de l'Afrique de l'Ouest existaient, et finalement, la diversité des objets métalliques en cuivre que le site a livrée. Il apparaît que la plupart des dépôts appartient à une seule occupation de longue durée par un peuple qui est arrivé pendant la cinquième siécle AD, en possession de la connaissance de métallurgie à base de cuivre et qui montrait au moins jusqu'au onzième siécle peu de modification dans leur culture materielle. Les résultats des fouilles de 1991–1992 montrent que cette interpretation doit être modifiée, car il y a eu du changement considérable dans le matèriel, comme l'introduction des métaux à base de cuivre entre AD 800–900. Dans cet article, nous avons résumé les résultats des nouvelles fouilles et nous suggérons que les anciennes interpretations ont été largement fondées sur du matériel perturbé, des dépôts mixtes qui donnaient une image fausse de l'homogenité pendant cette période.     

Cultural and trade practices in Sincu Bara (Senegal): a multi-proxy investigation

The Sincu Bara site in Senegal is one of the most famous archeological sites in Western Africa. Here we present the results of a multi-proxy study that combined microscopic analyses, carbon content, stable carbon isotope (δ¹³C) and radiocarbon (¹⁴C) measurements. This investigation exhibits a chronological framework in two phases: from 400 yr AD to 650 yr AD and 650 yr AD to 900 yr AD. Furthermore, it shows that besides basic potteries, some potsherds are notable for a temper exclusively made with human-harvested C4 plants. Finally, the ¹⁴C analysis performed on the organic slip strongly indicates the use of bitumen or bitumen-derived products for red slip preparation. This suggests the establishment of trade relationships with Nigerian and/or Trans-Saharan populations as early as 400 yr AD.