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La Nappe alluviale de Soucy-Les-Grandes-Pièces (Yonne, France) : reconstitution pluridisciplinaire du fonctionnement d’un cours d’eau du Pléistocène moyen
| Content Provider | Semantic Scholar |
|---|---|
| Author | Chaussé, Christine Lozouet, Nicole Limondin‑ Occhietti, Serge Voinchet, Pierre Bacon, J. |
| Copyright Year | 2002 |
| Abstract | Six Lower Palaeolithic sites within Middle Pleistocene alluvial deposits were recovered from a gravel pit quarried at Soucy in the Yonne valley (France). The alluvium age is assigned to marine isotopic stages 10 and 9, according to aminochronology and ESR dating. Malacofaunas from the upper sandy and loamy sand formations indicate continental temperate conditions. Reconstruction of the river dynamics is based on the morphology of the deposits, C-M diagram, palaeosol features observed on thin sections and molluscan successions. Several channels can be distinguished. The western bank of older channel A is edged by a point bar. Several secondary incisions occur on the eastern side of channel A. These shallow channels are infilled by sands and gravels indicative of high-energetic but intermittent discharges. The incision of the more recent channel B results from the eastward migration of the river, at a time of open-wood environment, as registered by molluscan assemblages. Ongoing processes of aggradation of the major river bed allows the construction of a levee. Later on, an alluvial greyish soil develops, marking a stabilization phase, while the forested environment tends to disappear, according to molluscan spectra. Afterwards, alluvial deposition starts again with floodplain deposits. The development of xerophilous molluscs species indicates open-ground environments which may point out to the climatic degradation characterizing the end of an interglacial. |
| Starting Page | 187 |
| Ending Page | 208 |
| Page Count | 22 |
| File Format | PDF HTM / HTML |
| DOI | 10.7202/004779ar |
| Volume Number | 54 |
| Alternate Webpage(s) | https://www.erudit.org/fr/revues/gpq/2000-v54-n2-gpq148/004779ar.pdf |
| Alternate Webpage(s) | https://doi.org/10.7202/004779ar |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
