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Holocene development of the east bank of the Gironde Estuary: geoarchaeological investigation of the Saint Ciers-sur-Gironde marsh
Mellallieu, S.J.; Massé, L.; Coquillas, D.; Alfonso, S.; Tastet, J.-P. (2000). Holocene development of the east bank of the Gironde Estuary: geoarchaeological investigation of the Saint Ciers-sur-Gironde marsh, in: Pye, K. et al. (Ed.) Coastal and estuarine environments: sedimentology, geomorphology and geoarchaeology. Geological Society Special Publication, 175: pp. 317-341
In: Pye, K.; Allen, J.R.L. (Ed.) (2000). Coastal and estuarine environments: sedimentology, geomorphology and geoarchaeology Geological Society Special Publication, 175 The Geological Society: London. ISBN 1-86239-070-3. 435 pp., more
In: Hartley, A.J. et al. (Ed.) Geological Society Special Publication. Geological Society of London: Oxford; London; Edinburgh; Boston, Mass.; Carlton, Vic.. ISSN 0305-8719, more
Peer reviewed article  

Available in  Authors 
    VLIZ: Geology and Geophysics [5937]

Authors  Top 
  • Mellallieu, S.J.
  • Massé, L.
  • Coquillas, D.
  • Alfonso, S.
  • Tastet, J.-P.

Abstract
    The nature of postglacial sea-Ievel change and sediment infilling of the Gironde Estuary, SW France, has previously been reconstructed using a sequence stratigraphic model. This paper examines specifically the development of the St Ciers-sur-Gironde marsh during the late Holocene. The study area forms the largest expanse of coastal wetlands on the east bank of the Gironde. A geoarchaeological approach is used incorporating borehole survey, sedimentological and diatom analysis, radiocarbon dating, archaeological, documentary and cartographic evidence, which aims to test and refine the previous model of estuarine development. The later Holocene sequence is characterized by alternating clay-silt and peat facies. Diatom evidence indicates that clay-silt units represent sedimentation under marine-brackish estuarine conditions in intertidal mudflat, and potentially saltmarsh, environments. The palaeo-environmental conditions represented by the main upper peat unit, dated to 5600-2600 BP, are currently unknown due to the absence of diatom evidence from these levels. Within an overlying trend of rising relative sea-Ievel over the past 6000 years, 3 negative sea-Ievel tendencies appear to have occurred. There is insufficient resolution in the present data set to determine the exact nature of each or their duration.

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