THE MIDCRETACEOUS PALEOENVIRONMENTAL CONDITIONS IN THE POLISH-CARPATHIANS - A PALYNOLOGICAL APPROACH

This study presents the results of a palynological investigation of Al bian-Cenomanian sections in the Polish Carpathians. The dinoflagellate cysts assemblages and palynofacies have been studied to examine chang es in palaeoenvironments. Several indicators, including analysis of ch osen groups of morphotypes of dinoflagellate cysts, the peridinoid/gon yaulacoid ratio, the marine/continental index, species diversity and d ominance, have been studied. A simplified classification of organic ma tter has been used to describe the total palynological content of the studied samples. Several pieces of evidence for a mid-Cretaceous trans gression have been recognized on the basis of the composition of selec ted dinoflagellate morphotypes. Previously described Local Oceanic Ano xic Events have been analyzed on the basis of the palynological record . Oxygen deficiency has been related to a stagnation due to the highst and of sea level.