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  • Author or Editor: Ágnes Siegl-Farkas x
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The author provides new data for the paleontological and stratigraphic understanding of the Upper Cretaceous formations of the Crimean Peninsula. Within the classic Bakhchisaray region 24 samples from six sections (Cenomanian-Maastrichtian) were studied. About 130 palynomorphs have been identified, 11 associations (spore-pollen and dinoflagellate) were differentiated and correlated with nannozones, foram zones and macropaleontological zones. The study confirms that during the Senonian the Crimean Peninsula belonged to the northern nearshore-neritic region of the Tethys and on land to the boreal Normapolles Phytogeographic Province.

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The Senonian succession of the Szilvágy-33 well in the Northern Zala Basin was investigated in order to re-evaluate its chronostratigraphic subdivision and depositional history. The studied sequence begins with the Ajka Formation of reduced thickness and atypical facies. This is followed by the Jákó Formation with the interfingering layers of the Ugod Limestone, and then the approximately 300 m-thick section of the Ugod Limestone which is covered by the Polány Marl. According to the palynologic and nannoplankton investigations, the entire encountered sequence can be assigned to the Campanian. The layers assignable to the Ajka Formation contain the sporomorph assemblage known from the upper section of the Jákó Formation in the Bakony basins, clearly indicating a considerable temporal shift of the lithofacies during transgression. The late transgression demonstrated in the Szilvágy-33 well suggests an elevated paleotopography. In contrast to the former assumptions, the transgression may not have reached the Bakony region via the Zala Basin; rather, both sub-areas were invaded by the sea from the South Alpine pelagic basins.

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