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Lithic materials in the Sado River’s shell middens: geological provenance and impact on site location
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Resumo(s)
This work presents a geological approach to the characterization of lithic materials collected at the Mesolithic Sado River’s shell middens, located between Alcácer do Sal and São Romão do Sado, 80 km SE of Lisbon. These shell middens contain abundant lithic materials from different lithologies, including mainly Siliceous Slates, Chert, Jasper and Quartz. A first look at the geological map pointed to a provenance from the Paleozoic terrains located close to the Torrão area, c. 20 km E of the sites, or from the Quaternary terraces along the Sado River. However, regional geological field studies and the macroscopic analysis of both the raw and transformed lithic materials, led to a different conclusion–most, if not all, of the lithic materials may have been collected in Paleogene conglomerates covering the region between Torrão and Alcácer.
The comparison between the regional extension of these conglomerates and the distribution of the shell middens, points to “material availability” as a crucial factor for its location along the Sado River.
Descrição
Palavras-chave
Sado river's shell middens Geological provenance Lithic materials
Contexto Educativo
Citação
PIMENTEL, N.; NUKUSHINA, D.; DINIZ, M.; ARIAS, P. (2015) - Lithic materials in the Sado River’s shell middens: geological provenance and impact on site location. In BICHO,N.; DETRY, C.; PRICE, D.; CUNHA, E. (eds.) - Muge 150th: The 150th Anniversary of the Discovery of Mesolithic Shellmiddens. Volume 1. Cambridge Scholars Publishing. pp. 321-332