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- W2084909430 abstract "In the Western Mediterranean, heaps of shells lying in the upper part of the continental slope between 90 and 340 m include boreal species which do not occur at present in this basin. The most common are Arctica arctica, Chlamys septemradiata, Modiolus modiolus. This malacological fauna seems to have been living when the sea-level was 80 m lower than at present. Series of 14C datings permit us to state precisely the age of this fauna, presumed to occur during the last Quaternary glaciation. The results obtained range from 31,500 ± 3,000 to 9,800 ± 200 years B.P. as far as boreal elements are concerned. However, the most frequent ages are between 9,800 ± 200 and 13,050 ± 300 B.P.. Thus, the boreal species seem to have had their highest development during the Würm IV when post-Glacial warming was under way. Among associated species still present in the Mediterranean, some shells are of the same age, while some are more recent: these species have survived post-Glacial times in a deep biotope which is not typical of the Mediterranean. En Méditerranée occidentale, des amas de coquilles situés à la partie supérieure de la pente continentale, entre 90 et 340 m, comprennent des espèces boréales disparues actuellement de ce bassin. Les plus communes sont Arctica arctica (= Cyprina islandica), Chlamys septemradiata, Modiolus modiolus. Ces faunes malacologiques semblent avoir vécu alors que le niveau de la mer était inférieur de 80 m au niveau actuel. Une série de datations au 14C permet de préciser l'âge de ces faunes, présumé contemporain de la dernière glaciation quaternaire. Les résultats obtenus s'échelonnent entre 31.500 ± 3.000 ans et 9.800 ± 200 B.P., en ce qui concerne les éléments nordiques. Les âges les plus fréquents sont cependant compris entre 9.800 ± 200 et 13.050 ± 300 B.P.: les espèces boréales semblent avoir eu leur maximum de développement au cours du Würm IV, déjà marqué par les réchauffements post-glaciaires. Parmi les espèces accompagnatrices encore présentes en Méditerranée, certains tests présentent des âges du même ordre de grandeur, d'autres sont plus récents: ces espèces ont survécu jusqu'à l'époque actuelle dans un biotope qui n'est pas typiquement le leur en Méditerranée." @default.
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- W2084909430 date "1972-12-01" @default.
- W2084909430 modified "2023-09-25" @default.
- W2084909430 title "Mollusques septentrionaux en Mediterranée occidentale: Datation par le 14C" @default.
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- W2084909430 doi "https://doi.org/10.1016/0031-0182(72)90024-7" @default.
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