Middle Miocene dinoflagellate cysts from the Korytnica clays (Góry Świętokrzyskie Mountains, Poland)
Abstract
Środkowomioceńskie cysty Dinoflagellata z iłów korytnickich (Góry Świętokrzyskie, Polska)
The Miocene Korytnica clays yielded a well preserved and rich dinocyst assemblage consisting of 28 genera and 47 species. The dinocyst assemblage is of early to lower part of middle Badenian (Middle Miocene) age. It belongs to the Unipontidinium aquaeductum dinocyst biozone corresponding to calcareous nannoplankton zone NN5-6. Palaeoecological analysis of dinocyst assemblages from Korytnica suggests a warm-water shallow-marine environment with normal salinity during the deposition of the Korytnica clays. Presence of few dinocyst species presumed to be oceanic ones indicates the connection of Korytnica Bay with open sea. Lack of peridinioid dinocysts, considered to be heterotrophic, suggests relatively low nutrient availability and/or a lack of freshwater input into the Korytnica basin. One new dinocyst genus Svenkodinium gen. nov. and two species S. minimum sp. nov. and 5. versteeghii sp. nov. are described.
The Miocene Korytnica clays yielded a well preserved and rich dinocyst assemblage consisting of 28 genera and 47 species. The dinocyst assemblage is of early to lower part of middle Badenian (Middle Miocene) age. It belongs to the Unipontidinium aquaeductum dinocyst biozone corresponding to calcareous nannoplankton zone NN5-6. Palaeoecological analysis of dinocyst assemblages from Korytnica suggests a warm-water shallow-marine environment with normal salinity during the deposition of the Korytnica clays. Presence of few dinocyst species presumed to be oceanic ones indicates the connection of Korytnica Bay with open sea. Lack of peridinioid dinocysts, considered to be heterotrophic, suggests relatively low nutrient availability and/or a lack of freshwater input into the Korytnica basin. One new dinocyst genus Svenkodinium gen. nov. and two species S. minimum sp. nov. and 5. versteeghii sp. nov. are described.