Abstract
In the Geneva basin a 127.3 m deep coring was carried out in the plain of Montfleury in order to get information about hydrogeology, lithology and chronology of the quaternary deposits. Palynostratigraphic studies on the so-called `'Marnes a lignite'' underlying the `'Alluvion ancienne'' revealed two interglacial sequences (Montfleury and Confignon). The Montfleury sequence belongs to the penultimate interglacial (Holstein sensu Welten 1988), the Confignon sequence must be assigned to a preceding interglacial. The chronostratigraphic position of the `'Alluvion ancienne'', which until now was believed to correspond to the Early-Wurm, must be revised.
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