New facts relating to the geology of the Paxos and Ionian zones, the outermost zones of the Hellenide structure of western Greece, are reported. In Leukas island, a shaly bituminous dolomite formation has been found to occur below the Cardita guembeli limestones which had previously been thought to be the oldest in Greece. In the eastern part of Cephallonia island there is evidence of transition between the Paxos and Ionian zones, represented principally by the extension of the limestone facies through the Oligocene and the presence of lower Miocene Flysch. The age of the gypsum found in the discordant upper Tertiary deposits is a problem; from their structural position and the nature of the associated limestone breccias, they could be Triassic or even Permian emplaced in two stages by a sort of diapirism.

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