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PORTAIL D'INFORMATION GÉOGRAPHIQUE

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  • dates, of which the majority represent lacustrine sediments at the marine/lacustrine boundary in cores from emerged lakes. The distance is 170 km and the difference in total emergence along this profile is more than 200 m.
  • In sediment cores from four small basins from 44 to 26 m above sea-level, the boundaries between marine, brackish and lacustrine sediments are precisely identified through their distinct diatom stratigraphy. In all basins the diatom successions