Calcareous dinoflagellate and calpionellid bioevents versus sea-level fluctuations recorded in the West-Carpathian (Late Jurassic/Early Cretaceous) pelagic environments

Recently established separate dinoflagellate cyst zonation combined with th e successive calpionellid events contribute to the HIRES of the Upper Juras sic and Lower Cretaceous Tethyan pelagic carbonate sequences. Compositional changes in dinoflagellate and calpionellid assemblages are correlated with eustatic sea-level fluctuations. Thus, parallel calpionellid and cyst zona tions give us more precise tools for the subdivision of deposits investigat ed as well as for better understanding and reconstruction of the paleoceano graphical and paleoecological conditions of the ancient marine environments . The calcareous resting cyst distribution is shown to be influenced by the whole complex of environmental factors such as sea-level transgressive/reg ressive pulses, hydrological regime, nutrient content etc.