ABSTRACT. The Middle Miocene (Badenian, Sarmatian and Pannonian) deposits from the region of Bistriţa, between the localities: Susenii Bârgăului, Livezile, Bistriţa, Sărata, Sărăţel, Budacu de Sus (Transylvanian Basin) have been analysed from the nannofloral point of view. The nannofossils are relatively scarce, excepting the ones related to Lower Badenian deposits. Only the fossil index for NN5 Zone -Sphenolithus heteromorphus, and for NN6 Zone -Discoaster exilis have been identified.

ABSTRACT. We investigated Lower Cretaceous calcareous nannofossils from Southern Apuseni Mountains. The studied section from Bucium Cerbu quarry is characterized by flysch deposits (rhythmical interbedded marls and sandstones), which were assigned to the Căbeşti Formation. The studied nannofossil assemblages yielded a high diversity. The Early Aptian age of the studied deposits was assigned based on both the Tethyan and Boreal calcareous nannofossil zonations. Several reworked Valanginian nannofossils were also observed in the Early Aptian in situ nannofloras. The nannofloras are dominated by tethyan and cosmopolitan species. Besides Boreal species are also present. The presence of boreal taxa (e.g., Kokia borealis, K. stelatta) in the Tethyan Realm reflects the palaeobiogeographical distribution and the biotic changes between Tethys and Boreal Realms in the Southern Apuseni Mountains. In the studied assemblages, the dominant species are Diazomatolithus lehmanii and Watznaueria barnesiae, which can reflect a high fertility in the surface water masses.