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The author presents the Sarmatian to Dacian (Paludina beds), evolution of the mollusc faunas (markers), shared alike by the Dacian and Pannonian (eastern part) basins. The mollusc associations from the Congeria beds (Pannonian s. str.) correlate with the Maeotian mollusc assemblages from the Dacian Basin. The Upper Congeria beds, probably starting from the ‘E Zone’ (Papp, 1951), correlate with the Pontian associations in the Dacian Basin. The author suggests that the Pannonian s.str./Pontian boundary should be set out in a lower position compared to the similar Dacian Basin boundary; considering that the Dacian Basin faunas immigrated from the Pannonian s. str. (“E Zone”) basin. Other elements, besides the biostratigraphic ones, also render evident these correlations, indicating the same evolution trend controlled by diastrophism (Attic and Rhodanian tectonic movements) and migration.