Quantitative calcareous nannoplankton biostratigraphy of the Oligocene/Miocene boundary interval in the northern part of the Buda Basin (Central Paratethys)

Katarína Holcová

Abstract


Relative abundances of seventeen calcareous nannoplankton species were analysed from around the Oligocene/Miocene boundary interval (NP 25–NN 2 Zones) in the northern part of the Buda Basin (Central Paratethys). A succession of four bioevents can be observed in all sections: FAD of Helicosphaera carteri, FAD of Reticulofenestra cf. pseudoumbilica, and FADs of Discoaster druggii and Helicosphaera scissura, FAD of Helicosphaera ampliaperta. The Oligocene/Miocene boundary lies between the FAD of Reticulofenestra cf. pseudoumbilica and FADs of Discoaster druggii and Helicosphaera scissura; events known to approximate it are not recognized.

 


Keywords


Central Paratethys; Oligocene/Miocene boundary; calcareous nannoplankton; quantitative biostratigraphy

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