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Lacustrine ooidal sands in Lake Geneva (Switzerland) : sedimentological evidence for high-energy conditions and lake-level rise in the Late Bronze Age : climatic implications and constraints on the location of lake-dwellings

Published inEclogae geologicae Helveticae, vol. 90, no. 1, p. 143-150
Publication date1997
Abstract

Sedimentological investigations on the western shore and lake-bottom of the Geneva Bay have revealed the presence of unconsolidated surface sediments mainly consisting of homogeneous ooidal sands. Their nature suggests deposition on a shoreface during a wave-dominated transgression phase reaching about 375 m a.s.l.. Sedimentological evidence indicates that this lake-level rise was strictly related to a climate modification characterized by persistent strong storm winds. Moreover, deposits interpreted as mud flows suggest that high magnitude rainfalls must have occurred frequently. Chronological data from both ooidal sands and archaeological remains indicate a Late-Bronze Age for these event, about 2800 ¹⁴C yr. BP. Such unfavourable natural conditions finally forced the prehistorical lake-dwellers to move landwards to higher ground.

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Keywords
  • Ooidal sand
  • Transgression
  • Paleoclimatology
  • Archaeology
  • Lake-dwelling
  • Late Bronze Age
  • Lake Geneva
  • Sables à oöides
  • Paléoclimatologie
  • Archéologie
  • Lacustres
  • Age du bronze tardif
  • Léman (lac)
  • Genève (Suisse, ville)
Citation (ISO format)
MOSCARIELLO, Andrea. Lacustrine ooidal sands in Lake Geneva (Switzerland) : sedimentological evidence for high-energy conditions and lake-level rise in the Late Bronze Age : climatic implications and constraints on the location of lake-dwellings. In: Eclogae geologicae Helveticae, 1997, vol. 90, n° 1, p. 143–150. doi: 10.5169/seals-168150
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ISSN of the journal0012-9402
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