International Geological Journal - Official Journal of the Carpathian-Balkan Geological Association

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CALCAREOUS DINOFLAGELLATE AND CALPIONELLID BIOEVENTS VERSUS SEA-LEVEL FLUCTUATIONS RECORDED IN THE WEST-CARPATHIAN (LATE JURASSIC/EARLY CRETACEOUS) PELAGIC ENVIRONMENTS

Published: Aug 2000

Pages: 229 - 243

Authors: DANIELA REHAKOVA

Abstract: Recently established separate dinoflagellate cyst zonation combined with the successive calpionellid events contribute to the HIRES of the Upper Jurassic 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 zonations give us more precise tools for the subdivision of deposits investigated as well as for better understanding and reconstruction of the paleoceanographical 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/regressive pulses, hydrological regime, nutrient content etc.

Keywords: Upper Jurassic, Lower Cretaceous, Western Carpathians, calcareous dinoflagellates, calpionellids, integrated biochronology, paleoecology, sea-level changes

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