A continuous seismic profile has shown that the Berre lagoon (Bouches-du-Rhone, France) comprises two depressions, cut in the upper Cretaceous or Miocene substratum, which are filled by sediments giving variable reflections. The depressions may have formed as a result of two Ponto-Pliocene erosional cycles succeeded by an influx of mixed detritus in the Quaternary.

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