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International audience; The Atlantic coast of north-west France is one of the classic shell-midden regions of the European Mesolithic, made famous by the excavations of Téviec and Hoedic in the first half of the 20th century. At this time, there was a lack of interest in the food refuse component of shell middens. By the end of the 1990s new study methods and techniques had also contributed to a better description of the varied activities of these coastal populations. In Atlantic France, new excavations have demonstrated that shell middens are not a site type but rather one of a variety of stratigraphic units that make up the total settlement pattern. Our perception of the Mesolithic hunter-gatherers of the French Atlantic coast has now changed from a population pre-occupied with day-to-day survival and forced to eat shellfish out of necessity, to fisher-hunter-gatherers involved in varied activities. Their knowledge of marine biotopes is revealed by the diversity of marine animals dedicated to food, but also by the collection of other raw materials washed up on the beach , including flint or shells devoid of flesh. The latter give us access to the symbolic sphere and were clearly and carefully selected for ornamental purposes.

The Mesolithic base-camp of Vale Marim I is located on the seashore of Sines harbour domain and covers a surface of about 1 ha. The archaeological excavation encompassed an area of about 260 m2. Several domestic structures were recovered; the fireplaces probably polarized economic and social action, like manufacture of lithic artefacts, cooking and probably the fish smoking activity; some areas without domestic structures and with very low density of lithic artefacts have been interpreted as latent remains of probable huts. The idea of a society based on an incipient kinship structure is admitted. The charcoal analysis has provided substantial information on the spread of pinewood (Pinus pinea) in keeping with a progressively mild climate, in the transition to the sixth millennium cal BC, favouring the development of open-air settlements. In sum, dwelling structures will be discussed in accordance with environmental changes and social organization.